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NDA || SCIENCE || PHYSICS MINI MOCK

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Question 1

A jet plane starting from rest accelerates uniformly at 8 ms-2 for 20 seconds before taking off. Find the minimum length of runway required.

Question 2

The coefficient of friction between the ground and the wheels of a vehicle is 0.35. The car starts from rest. Find the distance needed to achieve a velocity of 14 m/s. ( g = 10 m s-2)

Question 3

An automatic machine gun fires 3 bullets/sec of mass 30 g with a speed of 900 m/s. The gun is placed in a shooting mechanism. Find the amount of force exerted by the gun on the mechanism.

Question 4

Choose the correct option on the basis of the 2 statements.

Statement A : Puling a lawn roller is easier than pushing it.

Statement B : While pulling, the component of frictional force is lesser than that in pushing.

Question 5

A particle performs uniform circular motion with an angular momentum L. if the frequency of the particle’s motion is doubled and its kinetic energy is halved, the angular momentum becomes

Question 6

The current amplification factor for a npn transistor in common emitter configuration is 300. Find the amplification factor in common base mode.

Question 7

In which of the following positions a real image of a real object is not obtained on the screen?

Question 8

A wire is suspended vertically. One of its end is stretched by attaching a weight of 200N to the lower end. The weight stretches the wire by 1 mm. then the elastic energy in the wire is

Question 9

The loudness and pitch of a sound note depends on

Question 10

To demonstrate the phenomenon of interference, we require two sources which emit radiation.

Question 11

The length of a given cylinder wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be

Question 12

The earth radiates in the infrared region of the spectrum. The spectrum is correctly given by

Question 13

Two wires having resistances of 2 and 4 are connected to same voltages. The ratio of heat dissipated at the resistances will be :

Question 14

A sphere, a cube a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 1000C. which one of this will cool first

Question 15

A hollow sphere of charge does not produce an electric field at any ;
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