1. The motion of a falling ball toward Earth is due to the -------




... Answer is B. Gravitational force
Gravitational force is responsible for the motion of free-falling objects. This fore produces the gravitation acceleration in a body.


2. Newton's law of gravitation holds between every two objects on the-----




... Answer is D. on Universe
--------------


3. Numerical value of `\G` is --- ----




... Answer is A. `\G` = 6.673ｘ10⁻¹¹ N m² kg⁻²
-------------------


4. Gravitational field of Earth is directed -------




... Answer is A. towards the Earth
------------------


5.  -------------------- was the first scientist who gave the concept of gravitation.




... Answer is B. Newton
Laminar flow occurs at low speeds


6. According to Newton's law of universal gravitation force ∝




... Answer is D. Both (a) and (b)
F ∝ `\frac {m₁m₂}{r^2}


7. Gravitational force is always -------- :




... Answer is B. Attractive
--------------------------


8. Numerical value of ----------------- remains constant everywhere.




... Answer is B. `\G`
-------------------------


9. Gravitation force is ------ of the medium between the objects.




... Answer is B. Independent
----------------------


10. Near Earth's surface g = -----




... Answer is A. 10 m s⁻²`
 -----------------


11. Newton's law of gravitation is consistent with Newton's ------------- law of motion.




... Answer is C. 3rd
------------------------------


12. Spring balance is used to measure




... Answer is A. Mass
---------------


13. Your weight as measured on Earth will be on Moon.




... Answer is B. Decreased
W= mg, where on the moon gm = 1.625 m s⁻²


14.  Mass of Earth is ------




... Answer is B. 6.0 ｘ 10²⁴ kg
----------------------------


15. ------- is a natural satellite.




... Answer is B. Moon
-------------------


16.. A communication satellite completes its one revolution around the Earth in ------ hours.




... Answer is D. 24
---------------------------


17. The velocity of a satellite is ------------- of its mass. :




... Answer is A.  Independent
v = `\sqrt {g(R + h)}`


18. ---------- are used to putting satellites into orbits.




... Answer is C. Rocket
Given: -------------------------


19. The critical velocity `\v_c`= ------




... Answer is C. `\sqrt {gR}`
the formula for the velocity of the satellite is, v = `\sqrt {g(R + h)}`, when the value of h is very low then R + h = R and v =`\v_c`= `\sqrt {gR}`





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