NDA PHYSICS QUIZ

Question 1:

The water proof properties of the materials is due to the property of_____________

Surface tension

Viscosity

Specific gravity

Elasticity

Question 2:

A grasshopper can jump maximum distance of 1.6 m. It spends negligible time on the ground. How far can it go in 10 seconds -

Question 3:

What is the change in momentum of a car of mass 800 kg when its speed increases from 72 km/h to 90 km/h uniformly ?

2000 kg m/s

1000 kg m/s

4000 kg m/s

3000 kg m/s

Question 4:

A cricket ball of mass 150 g is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. The force of bat acts for 0.01 s on the ball. The average force exerted by the bat on the ball is-

480 N

600 N

500 N

300 N

Question 5:

A force of 50 dynes is acted on a body of mass 5 g which is at rest for an interval of 5 seconds, then the impulse created will be –

2.5 X 10^-3 N-s

1.5 X 10^-3 N-s

0.5 X 10^-3 N-s

3.5 X 10^-3 N-s

Question 6:

What is the reason for the small air bubbles in the water collected in a glass vessel to shine with a silvery luster?

Polarization

Reflection

Refraction

Total Internal Reflection

Question 7:

On which principle does a periscope work?

Reflection

Diffraction

Reflection and Interference

Reflection and Refraction

Question 8:

At what angle should two plane mirrors be placed to obtain three images of an object?

60°

30°

90°

120°

Question 9:

An object is placed at a distance of 60 cm from a concave mirror. What should be the focal length of the concave mirror to get its magnification of 1/2?

-20 cm

22 cm

30 cm

-30 cm

Question 10:

A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored?