Time left =
2
The force F acting on a particle in terms of time t and distance x is given by
F = (AcosBx) (CsinDt)
The dimensions of (AC) and (BD) respectively are
3
The density of a material in the CGS system is 8 g/cm3. In a system in which the unit of length is 5 cm and the unit of mass is 20 g, the density is
4
Two forces P and Q acting at a point are such that if P is reversed, the direction of the resultant is turned through 90°. Then
5
Of the following which one has dimensions different from the remaining three
6
If the resultant of the two vectors having magnitude of 7 and 4 is 11, the dot product of the two vectors could be
7
A force vector F = 2ˆI + 3ˆj N acts at a point P (4m, 2m) in xy plane then magnitude moment of force about origin of co-odinate system is
8
Maximum and minimum magnitudes of the resultant of two vectors of magnitudes P and Q are in the ratio 3 : 1. Which of the following relations is true
9
A particle has an initial velocity of 9 m/s due east and a constant acceleration of 2 m/s2 due west. The distance covered by the particle in the fifth second of its motion is
10
A very large number of balls are thrown vertically upwards in quick secessions is such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5m.The number of balls thrown per minute is: (Take g = 10 m/ s2 )
11
A ball is projected upwards from the top of tower with a velocity 50 ms-1 making an angle 30° with the horizontal. The height of tower is 70 m. After how many seconds from the instant of throwing will the ball reach the ground?
12
A man goes at the top of a smooth inclined plane. He releases a bag to fall
freely and he himself slides on inclined plane to reach the bottom. If v1 and v2 are the velocities of the man and bag respectively, then :
13
A projectile is thrown in the upward direction making an angle of 60° with the horizontal direction with a velocity of 147 ms-1. Then the time after which its inclination with the horizontal is 45°, is
14
The maximum height attained by a projectile is increased by 10% by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be
15
Passengers standing in a bus are thrown outwards when the bus takes a sudden turn. This happens because of
16
If an elevator is moving vertically up with an acceleration ‘a’, force exerted on the floor by a passenger of mass M travelling in the elevator is