CBSE
Multiple Choice QuestionsAssertion: A horse has to pull a cart harder during the first few steps of his motion.
Reason: The first few steps are always difficult.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The displacement time graph of a particle moving along a straight line is drawn below.
The accelerations of the particle during the regions OP, PQ and QR
| OP | PQ | QR |
| - | 0 | + |
| OP | PQ | QR |
| + | 0 | + |
| OP | PQ | QR |
| + | 0 | - |
| OP | PQ | QR |
| - | + | - |
The curve between loge and is
Which of the following velocity-time graphs shows a realistic situation for a body in motion?
If man were standing unsymmetrically between parallel cliffs, claps his hands and starts hearing a series of echoes at intervals of 1 s. If speed of sound in air is 340 ms', the distance between two cliffs would be
340 m
510 m
170 m
680 m
Two masses M1 = 5 kg and M2 = 10 kg are connected at the ends of an inextensible string passing over a frictionless pulley as shown. When the masses are released, then the acceleration of the masses will be
g
g/2
g/3
g/4
The position of a particle moving in the x-y plane at any time t is given by; x = ( 3t3 6t ) meters; y = ( t2 - 2t) meters. Select the correct statement.
acceleration is zero at t = 0
velocity is zero at t = 0
velocity is zero at t = 1s
velocity and acceleration of the particle are never zero
If maximum speed in SHM is given by Vm, what is its average speed?
Vm
Vm
Vm
Half life of a radioactive material is 5 years, then the percentage of it remained after 25 years will be
3.125%
6.25%
1.25%
25%
A 0.2 kg object at rest is subjected to a force N. What is the velocity after 6 s?
