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question_answer1) R and r are the radii of the Earth and Moon respectively. \[{{\rho }_{e}}\]and\[{{\rho }_{m}}\]are the densities of the Earth and Moon respectively. The ratio of acceleration due to gravity on the surface of the Earth to the Moon is (a) \[\frac{R}{r}.\frac{{{\rho }_{e}}}{{{\rho }_{m}}}\] (b) \[\frac{r}{R}.\frac{{{\rho }_{e}}}{{{\rho }_{m}}}\] (c) \[\frac{r}{R}.\frac{{{\rho }_{m}}}{{{\rho }_{e}}}\] (d) \[\frac{R}{r}.\frac{{{\rho }_{m}}}{{{\rho }_{e}}}\]
question_answer2) If R is the radius of Earth, the height at which the weight of a body becomes 1/4 its weight on the surface of the Earth is (a) \[2R\] (b) \[R\] (c) \[\frac{R}{2}\] (d) \[\frac{R}{4}\]
question_answer3) Mass of a planet is\[1/{{9}^{th}}\]of the mass of the Earth. Radius of the planet is 1/2 of that of Earth. If a man weighs 9 N on Earth, his weight on the planet is (a) 9 N (b) 244 N (c) 488 N (d) zero
question_answer4) The acceleration due to gravity at a height (take g = 10 on Earth's Surface.) above Earth's surface is\[\text{9 m}/\text{se}{{\text{c}}^{\text{2}}}\]. Its value at a point, at an equal distance below the surface of the Earth is_____\[\text{m}/\text{se}{{\text{c}}^{\text{2}}}\].
question_answer5) If the radius of the Earth was half of the present value, mass remaining same, the weight of the object changes ___ times.
question_answer6) The distance moved by a freely falling body (starting from rest) during the\[{{\text{1}}^{\text{st}}}\], \[{{\text{2}}^{\text{nd}}}\] and\[{{\text{3}}^{\text{rd}}}\]... nth second of its motion, are proportional to (a) \[(n-1)\] (b) \[(2n-1)\] (c) \[({{n}^{2}}-1)\] (d) \[(2n-1)/{{n}^{2}}\]
question_answer7) A body freely falling from rest has a velocity v after it falls through a distance h. The distance it has to fall down further, for its velocity to become double ...... is times h. (a) 4 h (b) 3 h (c) h (d) 16 h
question_answer8) A body is released from certain height and falls freely towards the earth. Exactly 1s later another body is released. Distance between the two bodies 2s after the release of the second body is (a) 4.9 m (b) 9.8 m (c) 24.5 m (d) 50 m
question_answer9) Distances covered by a freely falling body (starting from rest) during \[{{\text{1}}^{\text{st}}},\text{ }{{\text{2}}^{\text{nd}}},\text{ }{{\text{3}}^{\text{rd}}}....\text{ }{{\text{n}}^{\text{th}}}\] of its motion are proportional to (a) Even numbers (b) Odd numbers (c) All integral numbers (d) Square of integral numbers
question_answer10) A pebble is thrown vertically upwards from a bridge with an initial velocity of 4.9 m/s. It strikes the water after 2s. Height of the bridge is (a) 19.6 m (b) 14.7 m (c) 9.8 m (d) 4.9 m
question_answer11) A stone is dropped into a lake from a lower 500m high. The sound of the splash will be heard by a man on the tower after a time of (velocity of sound in air = 350 m/s) (a) 21 s (b) 10 s (c) 11.4 s (d) 1 s
question_answer12) A lead sphere of mass 20 kg has the same diameter as an aluminium sphere of mass 72 kg. The spheres are simultaneously dropped from a tower. When they are 10m from the ground, they have identical (a) Kinetic energy (b) Potential energy (c) Momentum (d) Acceleration
question_answer13) A body, freely falling under gravity, will have uniform (a) speed (b) velocity (c) momentum (d) acceleration
question_answer14) If the Earth is \[\text{1}/\text{4th}\] of its present distance from the Sun, the duration of the year would be (a) 1/4th of present year (b) 1/6th of present year (c) 1/8th of present year (d) 1/16th of present year
question_answer15) The period of revolution of planet A around the Sun is 8 times that of B. The distance of A from the Sun is how many times greater than that of B from the Sun? (a) 2 (b) 3 (c) 4 (d) 5
question_answer16) If the radius of Earth's orbit is made\[\text{1}/{{\text{4}}^{\text{th}}}\], then duration of a year will become (a) 8 times (b) 4 times (c) 1/8 times (d) 1/4 times
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