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question_answer1)
Luis throws four stones having the same weight on four different surfaces. The surfaces are icy, dry, sandy, and cemented. He throws each stone with the same force. On which of the given surfaces will the stone go the maximum distance before it stops?
A)
Icy surface done
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B)
Dry surface done
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C)
Sandy surface done
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D)
Cemented surface done
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question_answer2)
The joints of Latifs garage door are producing sound. To solve this problem, he must apply
A)
Saw dust in the joints of the door done
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B)
Water in the joints of the door done
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C)
Sand in the joints of the door done
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D)
Oil in the joints of the door done
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question_answer3)
In a cycling race, it is observed that a cyclist normally bends his body forward (as shown in the given figure).
The cyclist bends in order to
A)
Feel comfortable done
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B)
Reduce his weight done
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C)
Reduce the air drag done
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D)
Increase energy consumptionlution done
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question_answer4)
Which of the following actions does not increase friction?
A)
Threading tires done
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B)
Grinding on stones done
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C)
Making spikes on shoes done
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D)
Powdering a carom board done
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question_answer5)
The sides of matchboxes are made rough so as to
A)
Hold them easily done
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B)
Reduce their cost done
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C)
Make them strong done
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D)
Increase their friction done
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question_answer6)
Friction has advantages as well as disadvantages. Dilip prepares a list of some of the advantageous applications of friction, as shown in the given table. Application of friction I. Walking II. Writing III. Wearing out of shoes IV. Igniting a matchstick V. Gripping an object Which of the items listed in me given table is riot an advantage of friction?
A)
II done
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B)
III done
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C)
IV done
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D)
V done
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question_answer7)
A box is placed on three different surfaces "a marble floor, a cardboard sheet, and a sandpaper. The minimum forces required to simply move the box on the surfaces are \[{{F}_{m}},{{F}_{c}},\] and \[{{F}_{s}}\] respectively. The three forces can be arranged in the decreasing order as
A)
\[{{F}_{c}}<{{F}_{m}}<{{F}_{s}}\] done
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B)
\[{{F}_{c}}<{{F}_{s}}<{{F}_{m}}\] done
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C)
\[{{F}_{m}}<{{F}_{c}}<{{F}_{s}}\] done
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D)
\[{{F}_{s}}<{{F}_{c}}<{{F}_{s}}\] done
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question_answer8)
Pappu is applying a large force in order to push a heavy box lying on the floor. Then, his younger brother, Chintu spreads a little bit of oil on the floor. Now, Pappu feels that it has become relatively easier to move the box. This happens because the
A)
Oil magnifies the applied muscular force done
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B)
Oil reduces the friction between two surfaces done
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C)
Application of oil generates an upward thrust done
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D)
Application of oil reduces the gravitational force done
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question_answer9)
Brahma rolls down a ball from a certain height along an inclined plane. After reaching the bottom of the inclined plane, the ball rolls some distance horizontally along a surface. Brahma uses four different objects as the horizontal surface at the bottom of the inclined plane. The four objects are frosted glass sheet, cardboard sheet, sand paper, and wrinkle-free towel. In each case, he measures the distance travelled by the ball from the bottom of the inclined plane along the horizontal surface. On which surface will the ball move the least distance?
A)
Sand paper done
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B)
Cardboard sheet done
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C)
Frosted glass sheet done
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D)
Wrinkle-free towel done
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question_answer10)
X is a physical quantity that decreases with the use of any lubricants between two surfaces. What does X represent?
A)
Temperature done
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B)
Pressure done
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C)
Friction done
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D)
Density done
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question_answer11)
The given figure shows a man trailing a trolley bag. Suddenly, the wheels of the trolley bag get locked. The man realises that he has to put extra effort to drag the bag. The man finds it difficult to drag the bag because
A)
Friction between the wheels and the ground becomes negligible done
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B)
Static fiction, which is greater than rolling friction, comes into play done
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C)
Sliding friction, which is greater than rolling friction, comes into play done
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D)
Friction between the wheels and the ground starts opposing the motion done
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question_answer12)
In which of the following alternatives are the activities categorised correctly according to the advantages and disadvantages of the role of friction in them?
A)
B)
C)
D)
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question_answer13)
Anita throws four stones having the same weight on four different surfaces. The surfaces are icy» wooden, sandy and cemented. She throws each stone with the same force. On which of the given surfaces will the stone go the maximum distance before it stops?
A)
ley surface done
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B)
Sandy surface done
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C)
Wooden surface done
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D)
Cemented surface done
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question_answer14)
The force of friction decreases with ____i___ in interlocking between the surfaces in contact and it increases with ____ii____ in the pressing force between the surfaces. The information in which alternative completes the given statement?
A)
i-an increase, ii-an increase done
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B)
i-a decrease, ii-an increase done
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C)
i-an increase, ii-a decrease done
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D)
i-a decrease, ii-a decrease done
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question_answer15)
The tyres of vehicles get heated after they move on road. This is because of the
A)
Conversion of potential energy into heat energy done
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B)
Absorption of heat from the atmosphere done
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C)
Friction between the tyres and the road done
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D)
Conversion of mass into energy done
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question_answer16)
While walking on ice one should take small steps to avoid slipping. This is because smaller steps ensure.
A)
Large friction done
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B)
Smaller friction done
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C)
Large normal force done
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D)
Small normal force done
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E)
None of these done
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question_answer17)
Statement I: It is convenient to pull luggage fitted with rollers. Statement II: Rolling friction is smaller than sliding friction.
A)
Both statements I and II are true, statement II is the correct explanation for statement I. done
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B)
Both statements I and II are true, statement II is not the correct explanation for statement I. done
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C)
Statement I is true and statement II is false. done
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D)
Statement I is false and statement II is true. done
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question_answer18)
Statement I: We can live very happily if friction is not present in nature. Statement II: Aeroplane shape is streamlined to reduce frictional force.
A)
Both statements I and II are true, statement II is correct explanation for statement I. done
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B)
Both statements I and II are true, statement II is not the correct explanation for statement I. done
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C)
Statement I is true and statement II is false. done
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D)
Statement I is false and statement II is true. done
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question_answer19)
Which of the following doesnt reduce friction?
A)
Ball bearing done
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B)
Lubricant done
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C)
Rolling done
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D)
Grooving and treading done
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question_answer20)
The diagram given below shows a ball rolling down a slope. The ball finally comes to a stop by itself. Which of the following statements describes what most likely caused the ball to stop?
A)
The heat produced as a result of its motion. done
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B)
The speed produced as a result of its motion. done
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C)
The friction between the ball and the surface. done
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D)
The energy produced as a result of its motion. done
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