Reference no: EM132572367

MULTIPLE CHOICE QUESTIONS

(1) The phenomenon of gravitation was discovered by
(a) Isaac Newton
(b) Galileo Galilei
(c) Albert Einstein
(d) Archimedes

(2) A force acts on any object moving along a circle and it is directed towards the centre of the circle this is called the
(a) Centrifugal Force
(b) Centripetal Force
(c) Thrust
(d) Upthrust

(3) The line joining the planet and the sun sweeps equal areas in........... intervals of time
(a) Equal
(b) Unequal
(c) same
(d) none of these

(4) The gravitational force on any object due to Earth is always directed towards the.......... of the earth?
(a) Surface
(b) Centre
(c) parallel
(d) both a and b.

2. State True or False for the following

1. When a stone is thrown vertically upwards, gravitational force tries to reduce its velocity.
2. According to Newton's law of motion a force acting on a body results in its acceleration.
3. For calculating the motion of an object thrown upward, acceleration is taken negative.
4. The value of g is highest at the equator of Earth.

3. Fill in the blanks.

1.The value of g is ......... at the centre of the Earth.
2.To overcome Earth's gravitation, initial velocity must be larger than the..............
3. Total energy = ............... + ..............
4. The energy stored in an object because of its position or state is called..................

4. Answer the following.

1.State universal law of gravitation.
2.write Kepler's laws.
3. Derive the relation , g=Gm/R^2 .
4. Derive the relation, V=√2gR.
5. Match the columns.

1. The value of G                      a. vector quantity
2. Potential Energy                   b. higher the inertia
3. Higher the mass                   c. GMm/R
4. Acceleration due to gravity    d. 6.67×10^-11.