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question_answer1) If mass of one particle is increased by 50% and mass of other particle is decreased by 50%, the force between them (Assume, their initial masses are same) (a) Decreases by 25% (b) Decreases by 75% (c) Increases by 25% (d) Does not change
question_answer2) Four pairs (A, B, C, D) of bodies with their masses and separation are given in the following table. Pair Masses Separation A 20kg, 30kg 1m B 40kg, 60kg 0.5m C 30kg, 50kg 2m D 10kg, 40kg 2.5m Arrange the above pairs in the decreasing order of magnitude of gravitational force (a) D, C, B, A (b) A, D, B, C (c) B, A, C, D (d) C, A, D, B
question_answer3) Statement-1: g is inversely proportional to square of the radius of the planet. (Mass is constant) Statement-2: g is directly proportional to the radius of the planet. (Density is constant) (a) Statement-1 is correct. Statement-2 is correct, Statement-2 is correct explanation of Statement-1 (b) Statement-1 is correct, Statement-2 is correct, Statement-2 is not correct explanation of Statement-1 (c) Statement-1 is correct, Statement-1 is incorrect (d) Statement-1 is incorrect, Statement-1 is correct
question_answer4) Match the following List - I (Height from the surface of the earth) List - II (Value of g) (a) \[\frac{R}{10}\] (k) \[\frac{25g}{36}\] (b) \[\frac{R}{20}\] (I) \[\frac{100g}{121}\] (c) \[\frac{R}{30}\] (m) \[\frac{900g}{961}\] (d) \[\frac{R}{5}\] (h) \[\frac{400g}{441}\] (a) \[a-l,\text{b}-\text{h},\text{c}-\text{m},\text{d}-\text{k}\] (b) \[a-l,b-h,d-m,c-k\] (c) \[a-h,\text{ }b-l,\text{ }c-m,\text{ }d-k\] (d) \[a-h,b-m,c-l,d-k\]
question_answer5) A body from a height 'h' falls freely under gravity and reaches the ground. What is the time it takes to reach the ground?
question_answer6) A ball is dropped from a height of 5 m onto a sandy floor and penetrates the sand up to 10cm before coming to rest. What is the retardation of the ball in sand assuming it to be uniform?
question_answer7) A body is projected vertically up and the total distance travelled by it is s. What is the total time of its flight?
question_answer8) A stone is thrown vertically upwards with an initial velocity of \[\text{30 m}{{\text{s}}^{-1}}.\] What is the time taken for the stone to reach its maximum height?
question_answer9) A parachutist drops freely from an aero plane for 10 s and then the parachute opens out. Then he descends with a net retardation of\[\text{12 m}{{\text{s}}^{-\text{2}}}\]. If he strikes the ground with a velocity of\[~\text{2}0\text{ m}{{\text{s}}^{-\text{1}}},\]what is the height at which he gets out of the plane?
question_answer10) A stone thrown vertically upwards from the top of a tower with an initial velocity u reaches the ground with a velocity 3u. Find the height of the tower.
question_answer11) A freely falling body has a velocity V after falling through a distance h. What is the distance it has to fall down further for its velocity to become 2V?
question_answer12) A stone is dropped from the top of tall tower and after one second another stone is dropped from a balcony 20m below the top of the tower. If both the stones reach the ground at the same time. What is the height of the tower? [\[\text{g}=\text{1}0\text{m}{{\text{s}}^{-\text{2}}}\]]
question_answer13) A stone thrown vertically up with an initial velocity 'u' from the top of a tower reaches the ground with a velocity 3u. What is the height of the tower?
question_answer14) A body is thrown vertically up with a velocity of 100 m/s and another one is thrown 4 sec after the first one. How long after the first one is thrown will they meet? [Note: \[\text{g}=\text{1}0\text{m}/{{\text{s}}^{\text{2}}}\]]
question_answer15) A body is projected vertically with a speed is v and the time taken by it is T to reach maximum height H, Pick out the correct statement. (a) It reaches H/2 in T/2 sec (b) It acquires velocity U/2 in T/2 sec. (c) Its velocity is U/2 at H/2 (d) Same velocity at 2T
question_answer16) A ball falls from a height of 2m and undergoes repeated collisions with the ground. Each time it hits the ground it raises to half of the height from which it fell. What is the time interval between third and fourth hits with the ground? What is the total distance travelled till the moment it makes fourth hit with the ground? Neglect the time of contact with the ground.
question_answer17) The mean distance of sun from a planet is four times the distance of the sun from the earth. In how many years will planet complete one revolution around the sun?
question_answer18) Two satellites of a planet have periods 32 days and 256 days respectively. If the radius of the orbit of the one is R, find the orbital radius of the other.
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