14. A car accelerates from rest at a constant rate α for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by the car is

13. The displacement time graph of a moving particle is shown below. The instantaneous velocity of the particle is negative at the point

 

12. A particle moves along a straight line such that its displacement at any time t is given by s = ( t3 − 6t2 + 3t + 4 ) metres The velocity when the acceleration is zero is

94. Which gate is represented by the following truth table ?

 

10. When a p − n junction diode is reverse biased the flow of current across the junction is mainly due to ?

9. In the diagram, the input is across the terminals A and C and the output is across B and D. Then the output is ?

52. Angle of deviation ( δ ) by a prism (refractive index = μ and supposing the angle of prism A to be small) can be given by ?

27. Focal length of a convex lens will be maximum for ?

11. A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water is ?

The four capacitors, each of 25μF are connected as shown in fig. The dc voltmeter reads 200 V. The charge on each plate of capacitor is ?

A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is ?

A satellite in a force free space sweeps stationary interplanetary dust at a rate (dM/dt) = αv. The acceleration of satellite is