The motion of a rocket is based on the principle of conservation of _____________.

(a)

Linear momentum

(b)

K.E

(c)

Mass

(d)

Angular momentum

A simple pendulum is set up in a trolley which is moving with an acceleration 'a' on a horizontal plane. Then the thread of the pendulum in the mean position makes an angle with the vertical equal to _____________.

(a)

tan^-1(a/g) in the forward direction

(b)

tan^-1(a/g) in the backward direction

(c)

tan^-1(g/a) in the forward direction

(d)

tan^-1(g/a) in the backward direction

A marble block of mass 3 kg lying on ice when given a velocity of 5 ms^-1 is stopped by friction in 10s. Then the coefficient of friction is ______________.

(a)

0.01

(b)

0.05

(c)

0.03

(d)

0.06

A particle revolves round a circular pattern. The acceleration of the particle is inversely proportional to ______________

(a)

Velocity

(b)

Radius

(c)

Mass of the particle

(d)

a&c

A stone tied to a string is rotated with a uniform speed in vertical plane. If mass of the stone is m, length of the string is r and linear speed of the stone is v, then tension in the string, when the stone is at its lowest point is ______________

(a)

mg

(b)

\(\frac { { mv }^{ 2 } }{ r } -mg\)

(c)

\(\frac { { mv }^{ 2 } }{ r } \)

(d)

\(\frac { { mv }^{ 2 } }{ r } +mg\)