1).The engine of a truck moving a straight road delivers constant power. The distance travelled by the truck in time t is proportional to

A. t B.

2).

A beam of light is converging towards a point I on a screen. A plane parallel plate of glass

(thickness in the direction of the beam = t, refractive index = μ ) is introduced in the path of the

beam. The convergence point is shifted by

A. t (μ - 1) away B. t (1 + 1/μ ) away C. t (1 - 1/μ ) nearer D. t (1 + 1/μ ) nearer

3).

The amount of work done by the labourer

who carries n bricks, each of mass m, to the roof

of a house whose height is h is

A. n mgh B. mgh/n C. zero D. ghn/m

4).

The equation of a transverse wave on a

stretched string is given by

y = 0.05 sin π (2t/0.002 -x/0.1 ) where x and y

are expressed in metres and t in sec.

The speed of the wave is

A.100m/sec B. 50 m/s C. 200 m/s D. 400 m/s

5).

An electric motor while lifting a given load produces a tension of 4500 N in the cable

attached to the load. If the motor winds the cable at the rate of 2m/s, then power must be

A. 9 kW B. 15 kW C. 225 kW D. 9000 H.P