CBSE
Multiple Choice QuestionsA ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high, flow long will the ball take to hit the ground?
2 s
3 s
A body is thrown with a velocity of 9.8 m/s making an angle of 30° with the horizontal. It will hit the ground after a time
1.5 s
1 s
3 s
2 s
A glass marble projected horizontally from the top of a table falls of a distance x from the edge ofthe table. If h is the height of the table, then the velocity of projection is
gxh
g x + h
A wheel completes 2000 turns in completing a distance of 9.5 km, then diameter of the wheel is
1.5 m
1.5 cm
7.5 m
7.5 cm
Mark the correct option.
If a ball is projected with velocity v0 at an angle of elevation 30°, then
gravitational potential energy will, be minimum at the highest point of the trajectory
kinetic energy will be zero at the highest point of the trajectory
vertical component of momentum will be conserved
horizontal component of momentum will be conserved
The maximum range of a gun on horizontal terrain is 16 km if g = 10 m/s2. What must be the muzzle velocity of the shell?
200 m/s
100 m/s
400 m/s
300 m/s
If ar and at represent radial and tangential accelerations, the motion of a particle will be uniformly circular if :
ar = 0 and at = 0
ar = 0 and at ≠ 0
ar ≠ 0 and at = 0
ar ≠ 0 and at ≠ 0
An arrow is shot, its range is 200 m and its time of flight is 5 s. If g =10 m/s2, then the horizontal component of velocity of the arrow is :
12.5 m/s
250 m/s
31.25 m/s
40 m/s
Two bodies are thrown up at angles of 40° and 60°, respectively, with the horizontal. If both bodies attain the same vertical height, then the ratio of velocities with which these are thrown is:
If a and b are two vectors, then the value of
(a × b) × (a − b) is
2 (b x a)
− 2(b x a)
b x a
a x b
