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question_answer1)
Force is a
A)
push done
clear
B)
pull done
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C)
both (a) and (b) done
clear
D)
none of these done
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question_answer2)
1 newton = _______ dynes.
A)
103 done
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B)
104 done
clear
C)
105 done
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D)
106 done
clear
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question_answer3)
The CGS unit of force is
A)
newton done
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B)
pascal done
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C)
dyne done
clear
D)
None of these done
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question_answer4)
Which of the following is an example of contact force?
A)
Magnetic force done
clear
B)
Gravitational force done
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C)
Electric force done
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D)
Muscular force done
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question_answer5)
Force per unit area is _______.
A)
thrust done
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B)
pressure done
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C)
buoyancy done
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D)
density done
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question_answer6)
As we go to the higher altitude the atmospheric pressure _______.
A)
increases done
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B)
remain same done
clear
C)
decreases done
clear
D)
cannot say done
clear
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question_answer7)
Pascal is equal to:
A)
\[\text{N/}{{\text{m}}^{\text{2}}}\] done
clear
B)
\[\text{N/m}\times \text{s}\] done
clear
C)
\[\text{N/c}{{\text{m}}^{\text{2}}}\] done
clear
D)
\[\text{N}\text{.}{{\text{m}}^{\text{2}}}\] done
clear
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question_answer8)
Two stones A and B of masses 2 kg and 5 kg respectively are released from same height in vacuum. Which will reach on the ground first?
A)
Stone A done
clear
B)
Stone B done
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C)
Both will reach at same time done
clear
D)
None of these done
clear
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question_answer9)
Pressure is directly proportional to
A)
density done
clear
B)
height/depth done
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C)
acceleration due to gravity done
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D)
all of these done
clear
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question_answer10)
Electrostatic force is a
A)
contact force done
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B)
non-contact force done
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C)
balanced force done
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D)
unbalanced force done
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question_answer11)
When a force of 10 N is applied on a body it starts moving with a constant acceleration of2 m/s2. The mass of the body is
A)
2kg done
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B)
0.2kg done
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C)
20kg done
clear
D)
5kg done
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question_answer12)
When a cricketer catches the ball by his hands the force/forces coming in action is/are
A)
non-contact force done
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B)
gravitational force done
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C)
frictional force done
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D)
both (b) and (c) done
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question_answer13)
A stone falling from the roof of a house due to
A)
gravitational force done
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B)
magnetic force done
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C)
frictional force done
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D)
electrostatic force done
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question_answer14)
Force has
A)
only direction done
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B)
only magnitude done
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C)
both magnitude and direction done
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D)
neither magnitude nor direction done
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question_answer15)
The SI unit of force is
A)
newton done
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B)
dyne done
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C)
pascal done
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D)
none of these done
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question_answer16)
Which instrument is used for measuring at mospheric pressure?
A)
Hygrometer done
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B)
Barometer done
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C)
Hydrometer done
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D)
Sphygmomanometer done
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question_answer17)
A fluid is a substance that
A)
has no definite shape done
clear
B)
has no definite volume and shape done
clear
C)
has no definite volume done
clear
D)
is a liquid done
clear
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question_answer18)
A mass of 2 kg is accelerated at 2 m/sec2. Find the force applied on it.
A)
4N done
clear
B)
N done
clear
C)
8N done
clear
D)
N done
clear
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question_answer19)
A stone of mass 4 kg is dropped from a height. Find the force exerted by it on ground if acceleration due to gravity is 10 m/s2.
A)
20 N done
clear
B)
2.5 N done
clear
C)
40 N done
clear
D)
0.4 N done
clear
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question_answer20)
How much pressure will be applied on a body. If a force of 4 N is applied on its unit surface area. [Hint: Area = 1 m2]
A)
0.25 Pa done
clear
B)
2 Pa done
clear
C)
8 Pa done
clear
D)
4 Pa done
clear
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question_answer21)
A force of 12 N is acting perpendicular on a wooden block. What will be the thrust on it?
A)
12 N done
clear
B)
24 N done
clear
C)
48 N done
clear
D)
6N done
clear
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question_answer22)
Pressure is the ratio of force to the ____over which it is applied.
A)
surface done
clear
B)
volume done
clear
C)
distance done
clear
D)
area done
clear
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question_answer23)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column I | Column II |
A. Thrust | (p) F/A |
B. Pressure | (q) Force |
C. Atmospheric pressure | (r) Decrease with altitude |
D. liquid pressure | (s) Monometer |
A)
\[A\to (q);B\to (p);C\to (r);D\to (s)\] done
clear
B)
\[A\to (r);B\to (p);C\to (q);D\to (s)\] done
clear
C)
\[A\to (p);B\to (r);C\to (s);D\to (q)\] done
clear
D)
\[A\to (s);B\to (q);C\to (p);D\to (r)\] done
clear
View Solution play_arrow
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question_answer24)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column I | Column II |
A. Force | (p) unit of force |
B. Contact force | (q) magnetic force |
C. Non-contact force | (r) frictional force |
D. Newton | (s) mass\[\times \]acceleration |
A)
\[A\to (q);B\to (p);C\to (r);D\to (s)\] done
clear
B)
\[A\to (r);B\to (p);C\to (q);D\to (s)\] done
clear
C)
\[A\to (p);B\to (r);C\to (s);D\to (q)\] done
clear
D)
\[A\to (s);B\to (r);C\to (q);D\to (p)\] done
clear
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question_answer25)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column I | Column II |
A. Acceleration | (p) Contact force |
B. Pressure | (q) No atmospheric pressure |
C. Space | (r) Force/mass |
D. Muscular force | (s) Barometer |
A)
\[A\to (q);B\to (p);C\to (r);D\to (s)\] done
clear
B)
\[A\to (r);B\to (s);C\to (q);D\to (p)\] done
clear
C)
\[A\to (p);B\to (r);C\to (s);D\to (q)\] done
clear
D)
\[A\to (s);B\to (r);C\to (q);D\to (p)\] done
clear
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question_answer26)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage Liquid pressure in a container doesn't depend on the shape of the container but it any depends on the height of the liquid column. The pressure due to a liquid at a point at a depth h from the surface of the liquid is given by\[P=\rho gh\]where, \[\rho \] is the density of the liquid and g is the acceleration due to gravity. A cylindrical container is full of water. The pressure at the bottom is P. Now, the water is replaced by cooking oil of density twice the density of water. The new pressure at the bottom is
A)
4 P done
clear
B)
2 P done
clear
C)
1.5 P done
clear
D)
3P done
clear
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question_answer27)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage Liquid pressure in a container doesn't depend on the shape of the container but it any depends on the height of the liquid column. The pressure due to a liquid at a point at a depth h from the surface of the liquid is given by\[P=\rho gh\]where, \[\rho \] is the density of the liquid and g is the acceleration due to gravity. A cylindrical container is full of water. The pressure at the bottom is P. Now, the water is replaced by cooking oil of density twice the density of water. If half of the water is taken out, what is the pressure at the bottom?
A)
P done
clear
B)
\[\frac{1}{2}P\] done
clear
C)
\[\frac{3}{2}P\] done
clear
D)
2P done
clear
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question_answer28)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage Liquid pressure in a container doesn't depend on the shape of the container but it any depends on the height of the liquid column. The pressure due to a liquid at a point at a depth h from the surface of the liquid is given by\[P=\rho gh\]where, \[\rho \] is the density of the liquid and g is the acceleration due to gravity. A cylindrical container is full of water. The pressure at the bottom is P. Now, the water is replaced by cooking oil of density twice the density of water. If the container is carried on a mountain then what will be the pressure at the bottom?
A)
less than P done
clear
B)
more than P done
clear
C)
equal to P done
clear
D)
None of these done
clear
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question_answer29)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: Steel nails are pointed at one end to have least area of contact with surface. Reason: Least area exerts high pressure.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer30)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: Magnetic force is a non-contact force. Reason: Unlike poles of magnet attracts each other.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer31)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: A moving toy car stops after a little distance. Reason: Friction opposes the motion.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer32)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: Apple falls on the ground, due to gravitational force. Reason: Gravitational force is a contact force.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer33)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: Sea divers wear special suits. Reason: There is no effect of gravity under the sea.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer34)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: Fluid exerts pressure on the walls of container. Reason: Fluids have definite shape and size.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer35)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: There is high atmospheric pressure in the space. Reason: Astronauts wear special suits.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer36)
Direction: The questions in this segment consist of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: When a stone is thrown vertically upward, after getting a certain height' it comes back to the earth. Reason: Stone has to work against the force of friction of air.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer37)
DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement-1: When one body moves or tries to move on the surface of another body, its speed continuously decreases. Statement-2: Friction is a contact force.
A)
Statement (1) is correct while statement (2) is incorrect. done
clear
B)
Statement (2) is correct while statement (1) is incorrect. done
clear
C)
Both statements are correct done
clear
D)
Both statements are incorrect. done
clear
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question_answer38)
DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement-1: Atmospheric pressure increases with increase in depth of sea. Statement-2: Pressure is directly proportional to depth/height.
A)
Statement (1) is correct while statement (2) is incorrect. done
clear
B)
Statement (2) is correct while statement (1) is incorrect. done
clear
C)
Both statements are correct done
clear
D)
Both statements are incorrect. done
clear
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question_answer39)
Wooden block will
A)
move in the direction of force A done
clear
B)
move in the direction of force B done
clear
C)
not move done
clear
D)
None of these done
clear
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question_answer40)
Which point have more pressure in the container?
A)
point A done
clear
B)
point B done
clear
C)
point C done
clear
D)
point D done
clear
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question_answer41)
Container and , contain pure water but in different quantity. If both of the containers have same shape, same size and kept at same surface but height from the ground \[{{h}_{1}}>{{h}_{2}}.\] Which container will have more pressure?
A)
Same in A and B done
clear
B)
Container B done
clear
C)
Container A done
clear
D)
None of these done
clear
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question_answer42)
A wooden block is placed on a table. It exerts a force of 80 N on the table. If the base area of block is 2 m2 then what will be the pressure on the table?
A)
160 Pa done
clear
B)
80 Pa done
clear
C)
40 Pa done
clear
D)
240 Pa done
clear
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question_answer43)
Opening a door is an example of
A)
contact force done
clear
B)
non-contact force done
clear
C)
magnetic force done
clear
D)
balanced force done
clear
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question_answer44)
When a body is said to be under balanced forces then the resultant force applied on the body is
A)
one done
clear
B)
infinite done
clear
C)
zero done
clear
D)
none of these done
clear
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question_answer45)
Two bodies of masses m and 6m are moving under same magnitude of force. The ratio of their accelerations will be
A)
1 : 6 done
clear
B)
6 : 1 done
clear
C)
1 : 36 done
clear
D)
36 : 1 done
clear
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question_answer46)
The pressure of the water at the bottom of the pond is _______ at the surface of the pond.
A)
lower than done
clear
B)
same done
clear
C)
higher than done
clear
D)
either lower or higher done
clear
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question_answer47)
If a pressure of 8 Pa acts on the surface of area2m2, then the force acting on the surface is
A)
10 dynes done
clear
B)
4.00 N done
clear
C)
16N done
clear
D)
4.00 dynes done
clear
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question_answer48)
The pressure exerted by a column of liquid is independent of the ______.
A)
density of the liquid done
clear
B)
weight of the liquid done
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C)
depth of the liquid done
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D)
shape of the container done
clear
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question_answer49)
A force \[{{F}_{1}}\] acting on a body of 2 kg produces an acceleration of 2.5 m/sec2. Another force \[{{F}_{2}}\]acting on the body of mass 5 kg produces an acceleration of 2 m/sec2. Find the ratio of\[{{F}_{2}}/{{F}_{1}}.\]
A)
2 done
clear
B)
4 done
clear
C)
6 done
clear
D)
8 done
clear
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question_answer50)
An astronaut with all her equipment has a mass of 95 kilograms. How much will the weight on the moon, where the acceleration due to gravity is \[1.67\,\text{m}{{\text{s}}^{-2}}?\]
A)
159 N done
clear
B)
169 N done
clear
C)
149 N done
clear
D)
100 N done
clear
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question_answer51)
What force is needed to a accelerate a 60 kg wagon from rest to \[5.0\,\text{m}{{\text{s}}^{-2}}\] in 2.0 seconds?
A)
100 N done
clear
B)
120 N done
clear
C)
150 N done
clear
D)
130 N done
clear
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question_answer52)
A 500 kg rocket is fired straight up from the earth, the engine providing 7500 newton of thrust. Its acceleration is
A)
4.5 m/s2 done
clear
B)
5.2 m/s2 done
clear
C)
9.8 m/s2 done
clear
D)
15 m/s2 done
clear
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question_answer53)
When a body is stationary
A)
there is no force acting on it done
clear
B)
the force acting on it not in contact with it done
clear
C)
the combination of forces acting on it balances each other done
clear
D)
the body is in vacuum done
clear
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question_answer54)
What force would be required to produce an acceleration of 4 m/s2 in a moving wall of mass6kg?
A)
1.2 N done
clear
B)
1.5 N done
clear
C)
24 dynes done
clear
D)
24 N done
clear
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question_answer55)
Two forces 200 N and 300 N acting on a body in same direction. What is resultant force?
A)
1.5 N done
clear
B)
100 N done
clear
C)
0.66 N done
clear
D)
500 N done
clear
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question_answer56)
What will be the change in acceleration of as liding brick, if its mass is doubled, while a constant force is acting on it. Acceleration will be
A)
2a done
clear
B)
a/2 done
clear
C)
a/4 done
clear
D)
4a done
clear
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question_answer57)
A car of mass 1000 kg can produce an acceleration of 8 m/s2.Calculate the force produced by the engine ignoring friction.
A)
10,000 N done
clear
B)
100,000 N done
clear
C)
8000 N done
clear
D)
18000N done
clear
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question_answer58)
When an object is at rest on a surface - what canbe said about the forces on it?
A)
they all are equal done
clear
B)
they are unbalanced done
clear
C)
there are not acting on it done
clear
D)
all the forces cancel out done
clear
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question_answer59)
What is the surface area of table top if a force of120 N exerted on it produces a pressure of20 Pa?
A)
2400m2 done
clear
B)
60m2 done
clear
C)
6m2 done
clear
D)
240m2 done
clear
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question_answer60)
The pressure at a point in a liquid is proportional to the________ of the liquid and the depth of the point.
A)
density done
clear
B)
force done
clear
C)
area done
clear
D)
gravitational acceleration done
clear
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question_answer61)
Gaurav wants to accelerate a body of mass2 kg at 10 m/sec2. On the other hand, Sahil wants to get accelerate a body of mass 5 kg at 2.5m/sec2. Who will need to apply more force?
A)
both will apply same force done
clear
B)
Gaurav done
clear
C)
Sahil done
clear
D)
none of these done
clear
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question_answer62)
Stones A, B, C and D of same masses are thrown on a wall. Acceleration produced in them are \[2m/se{{c}^{2}},\text{ }3\text{ }m/se{{c}^{2}},\text{ }5\text{ }m/se{{c}^{2}},\text{ }4\text{ }m/se{{c}^{2}}\] respectively. Arrange the force exerted by the stones in descending order.
A)
\[{{f}_{A}}>{{f}_{B}}>{{f}_{C}}>{{f}_{D}}\] done
clear
B)
\[{{f}_{D}}>{{f}_{C}}>{{f}_{B}}>{{f}_{A}}\] done
clear
C)
\[{{f}_{A}}>{{f}_{B}}>{{f}_{D}}>{{f}_{C}}\] done
clear
D)
\[{{f}_{C}}>{{f}_{D}}>{{f}_{B}}>{{f}_{A}}\] done
clear
View Solution play_arrow
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question_answer63)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
A.\[dyne/c{{m}^{2}}\] | (p) 760 mm of Hg |
B. 76 cm of Hg | (q)\[N{{m}^{-2}}\] |
C. 1 Pa | (r)\[1.013\times {{10}^{-5}}N{{m}^{-2}}\] |
D. 1 Pa | (s)\[{{10}^{-1}}N{{m}^{-2}}\] |
A)
\[A\to (q);B\to (p);C\to (r);D\to (s)\] done
clear
B)
\[A\to (r);B\to (p);C\to (q);D\to (s)\] done
clear
C)
\[A\to (p);B\to (r);C\to (s);D\to (q)\] done
clear
D)
\[A\to (s);B\to (p);C\to (q);D\to (r)\] done
clear
View Solution play_arrow
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question_answer64)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
A. Fielder sloping a ball | (p) Lifting |
B. Opening a door | (q) Muscular force |
C. Shutting a door | (r) Pulling |
D. Drawing a bucket of water from a well | (s) pushing |
A)
\[A\to (q);B\to (p);C\to (r);D\to (s)\] done
clear
B)
\[A\to (r);B\to (p);C\to (q);D\to (s)\] done
clear
C)
\[A\to (q);B\to (r);C\to (s);D\to (p)\] done
clear
D)
\[A\to (s);B\to (r);C\to (q);D\to (p)\] done
clear
View Solution play_arrow
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question_answer65)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage Pressure is defined as the force exerted over a unit of area. \[\text{Pressure}\,\text{=}\frac{\text{force}}{\text{area}}\] Place a book on a bathroom scale and, whether you place it on its back, on its side, or balanced on a corner, it still exerts the same force. The weight reading is the same. Now balance the book on the palm of your hand and you sense a difference - the pressure of the book depends on the area over which the force is distributed.
Which book will exert more pressure?
A)
Book 1 done
clear
B)
Book 2 done
clear
C)
Both exert equal pressure done
clear
D)
Can't be determined done
clear
View Solution play_arrow
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question_answer66)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage Pressure is defined as the force exerted over a unit of area. \[\text{Pressure}\,\text{=}\frac{\text{force}}{\text{area}}\] Place a book on a bathroom scale and, whether you place it on its back, on its side, or balanced on a corner, it still exerts the same force. The weight reading is the same. Now balance the book on the palm of your hand and you sense a difference - the pressure of the book depends on the area over which the force is distributed.
If a force of 20N is applied on the surface of area 0.1 m2 then pressure experienced is
A)
5N/m2 done
clear
B)
100 N/m2 done
clear
C)
200 N/m2 done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer67)
Directions: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: The acceleration produced by a force in the motion of a body depends only up on its mass. Reason: Larger is the mass of the body, lesser will be the acceleration produced.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true and but R is not the correct explanation of A. done
clear
C)
A is true but R is a false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer68)
Directions: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: If the net external force on the body is zero, then its acceleration is zero. Reason: Acceleration does not depend on force.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true and but R is not the correct explanation of A. done
clear
C)
A is true but R is a false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer69)
Directions: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: An object can move with constant velocity if no net force acts on it. Reason: No net force is needed to move an object with constant velocity.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true and but R is not the correct explanation of A. done
clear
C)
A is true but R is a false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer70)
Directions: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reasons R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion: A body is momentarily at rest when it reverses the direction. Reason: A body cannot have acceleration if its velocity is zero at a given instant of time.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true and but R is not the correct explanation of A. done
clear
C)
A is true but R is a false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer71)
DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: It is easier to push a nail into a wooden box by the pointed end. Statement-2: Nail's head is easier to hit. Statement-3: Pressure applied on all nails is same whatever is their size.
A)
Statement (1) and (3) are incorrect while statement (2) is correct. done
clear
B)
Statement (1) and (2) are incorrect while (3) is correct. done
clear
C)
All the statements are correct. done
clear
D)
All the statements are incorrect. done
clear
View Solution play_arrow
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question_answer72)
DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: Porters place a round piece of cloth on their heads. Statement-2: Pressure is inversely proportional to area on which it acts. Statement-3: Pressure is independent of area of surface in contact.
A)
Statement (1) and (3) are incorrect while statement (2) is correct. done
clear
B)
Statement (1) and (2) are incorrect while (3) is correct. done
clear
C)
All the statements are correct. done
clear
D)
All the statements are incorrect. done
clear
View Solution play_arrow
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question_answer73)
In which condition the wooden block will move?
A)
A done
clear
B)
B done
clear
C)
Both A and B done
clear
D)
None of these done
clear
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question_answer74)
Rajiv pulls a wooden box from one end with a force of 20 N, and Saurabh starts pushing the same box from opposite end with a force of 15N. If a resultant acceleration of 2m/sec2 creates in the wooden box. Find the mass of the wooden box. (Hint: Resultant of the force in the same direction is addative)
A)
5kg done
clear
B)
70kg done
clear
C)
2.5kg done
clear
D)
17.5kg done
clear
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question_answer75)
Twinkle throws a stone of mass 1 kg in vertically upward direction. Its velocity continuously decreases. After attaining a certain height its velocity becomes zero and it starts falling towards earth under gravitational force. If the acceleration due to gravity working on it is10 m/sec2. Then, how much force will it exert on ground, when it will strike to the ground?
A)
10 N done
clear
B)
20 N done
clear
C)
N done
clear
D)
100 N done
clear
View Solution play_arrow
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question_answer76)
Rahul starts drilling a steel nail in a wooden block with its sharp side. The area of sharp side is 0.1 m2. He applies a force of2N on it. How much pressure will the nail exert on the wooden block?
A)
Pa done
clear
B)
0.2 Pa done
clear
C)
20 Pa done
clear
D)
200 Pa done
clear
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question_answer77)
The diagram below shows two dogs pulling on a rope with constant but unequal forces.
In which compass direction will both dogs most likely move?
A)
east done
clear
B)
west done
clear
C)
north done
clear
D)
south done
clear
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question_answer78)
Name the device in the diagrams used to measure force.
A)
spring scale done
clear
B)
voltmeter done
clear
C)
thermometer done
clear
D)
graduated cylinder done
clear
View Solution play_arrow