Physics test
1. Motion of a particle is given by equation s = (3t³ + 7t² + 14t + 8) m. The value of acceleration of the particle at t = 1 sec is
(a) 10 m/s² (b) 32 m/s²
(c) 23 m/s² (d) 16 m/s²2. A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed v. The average speed is 48 km/h. The value of v is
(a) 56 km/h (b) 60 km/h
(c) 50 km/h (d) 48 km/h.
3.A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with
a speed v. The two balls meet at t = 18 s. What is the value of v ? (Take g = 10 m/s²)(a) 75 m/s (b) 55 m/s(c) 40 m/s (d) 60 m/s
4.A train of 150 metre length is going towards north direction at a speed of 10 m/s. A parrot flies at the speed of 5 m/s towards south direction parallel to
the railways track. The time taken by the parrot to cross the train is(a) 12 s (b) 8 s (c) 15 s (d) 10 s
5. A transverse wave propagating along x-axis is represented by y(x, t) = 8.0sin(0.5Ï€x – 4Ï€t –Ï€/4) where x is in metres and t is in seconds. The speed of
the wave is(a) 8 m/s (b) 4Ï€m/s
(c) 0.5π m/s (d) π/4 m/s
6. A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is
(a) 3 : 2 (b) 2 : 3
(c) 9 : 4 (d) 4 : 9.
(a) 3 : 2 (b) 2 : 3
(c) 9 : 4 (d) 4 : 9.
7. The temperature at which the speed of sound becomes double as was at 27°C is
(a) 273°C (b) 0°C(c) 927°C (d) 1027°C
8. A man of 50kg mass is standing in a gravity free space at a height of 10m above the floor. He throws a stone of 0.5kg mass downwards with a speed 2m/s when the stone reaches the floor, the distance of the man above the floor will be:
(a) 9.9m (b) 10.1m
(c) 10m (d) 20m
9. The speed of a projectile at its maximum height is
half of its initial speed. The angle of projection is
(a) 60° (b) 15°
(c) 30° (d) 45°
half of its initial speed. The angle of projection is
(a) 60° (b) 15°
(c) 30° (d) 45°
10. An electric fan has blades of length 30 cm measured from the axis of rotation. If the fan is rotating at 120 rpm, the acceleration of a point on the tip of the blade is
(a) 1600 m s–² (b) 47.4 m s–²
(c) 23.7 m s–² (d) 50.55 m s–²
