A scientific way of doing things involve _____________.

(a)

identifying the problem

(b)

collecting data

(c)

controlled experimentation

(d)

all the above

The numerical ratio of average velocity to average speed is ________________.

(a)

<1

(b)

=1

(c)

≤1

(d)

=0

The angle between anti parallel vectors is _____________

(a)

0^o

(b)

90^o

(c)

180^o

(d)

0 (or) 180^o

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

The accelerated train is an example for _____________.

(a)

inertial frame

(b)

non-inertial frame

(c)

both (a) and (b)

(d)

none of the above

A motor which is capable of raising 2,000 litres of water in 3 mins from a well 120 m deep. So what is the power of a motor?

(a)

8.730 kW

(b)

7.840 kW

(c)

11.652 kW

(d)

13.066 kW

Two masses of 1g and 4g arc moving with equal kinetic energy. The ratio of the magnitudes of their linear momenta is _______________.

(a)

1: 4

(b)

\(\sqrt 2:1\)

(c)

1: 2

(d)

1: 16

Conservative force is _______________.

(a)

electrostatic force

(b)

magnetic force

(c)

gravitational force

(d)

all the above

The reduced mass of two particles having masses m and 2m is _____________.

(a)

2m

(b)

3m

(c)

2m/3

(d)

m/2

A wheel of radius 0.5 m is mounted so as to rotate about a horizontal axis through its centre. A string of negligible mass wrapped over the circumference carries a mass of 2kg attached at its free end. If the mass descends from rest through one metre in 5 seconds, then the angular velocity at the end of 5th second is _______________.

(a)

0.2 rad/s

(b)

0.4 rad/s

(c)

0.8 rad/s

(d)

0.6 rad/s