Two charged particles having charges +25μC and +50μC are separated by a distance of 8 cm. The ratio of forces on them is:

1) 1 : 1
2) 1 : 2
3) 4 : 1
4) 2 : 1

 The point of suspension of l simple pendulum with normal time period T1 is moving upward according to equation y = Kt² where k = 1m/s². If new time period is T2  the ratio T₁² /T²₂ will be :

1) 2/3 
2) 5/6
3)  6/5
4) 3/2

A worker does 500 J of work on a 10 kg box. If the box transfers 375 J of heat to the floor through the friction between the box and the floor, what is the velocity of the box after the work has been done on it?

1) 5 m/s
2) 10 m/s.
3) 12.5 m/s
4) 50 m/s

 A cart of mass has a block of mass m attached to it as shown in figure. The coefficient of friction between the block and the cart is µ. What is the minimum acceleration of the cart so that the block m does not fall

1)µg
2) g/µ
3)µ/g
4)Mµg/m

A cart on an air track is moving at 0.5 m/s when the air is suddenly turned off. The cart comes to rest after traveling 1 m. The experiment is repeated, but now the cart is moving at 1 m/s when the air is turned off. How far does the cart travel before coming to rest?

1) 1 m

2) Ö2 m

3) 2 m

4) 4 m

In a compound microscope, the focal lengths of two lenses are 2.5 cm and 6.25 cm. An object is placed at 2 cm from objective and the final image is formed at 25 cm from eye lens. The distance between the two lenses is:
1.12 cm
2.15 cm
3.18 cm
4.None of the above

Two points P and Q perform SHM along the same straight line, greatest distance between P and Q noticed by an observer studying the motion is found to be A (A=amplitude). Hence, we can deduce that in this case P leads Q ( or Q leads P) by a phase angle of

1) $$\pi$$
2) $$\dfrac { 2\pi }{ 3 }$$
3) $$\dfrac { \pi }{ 2 }$$
4) $$\dfrac { \pi }{ 3 }$$

A travelling wave has a velocity of 400 m/s and has a wavelength of 0.5 m. What is the phase difference between two points in the wave that are 1.25 milli secs apart

1) 2π
2) 2π /3
3) 2π/5
4) π/6

 The electroscope used in the electrostatics experiment is typically charged using a power supply with a voltage range:

(1) 0 to 30 volts.

(2) 0 to 100 volts.

(3) 0 to 300 volts.

(4) 0 to 3000 volts..

A car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is the magnitude of the average velocity of the car during this 20.-second interval?
 
 1) 2.5 m/s
 2) 5.0 m/s
 3) 6.5 m/s
 4) 7.0 m/s