If you don't have an account, click here

Welcome Guest | Support: +91 -8080-544-000

Download:

Support: +91 -8080-544-000

HH MM SS

The radii of circular orbits of two satellites around the earthare in ratio 1 : 4, then find the ratio of their respective periods of revolution.

8 : 1

4 : 1

1 : 8

1 : 4

Gravitational constant

Refractive index

Dielectric constant

Relative density

When a tall empty jar is placed below a water tap from which water flows out slowly into the jar producing a sound note, what will happen to the pitch of the note?

Remains unchanged

Gradually rise

Gradually fall

None of these

On what does the internal energy of an ideal gas depend?

In what conditions does a gas behaves more closely as an ideal gas?

Low pressure and low temperature

Low pressure and high temperature

High pressure and low temperature

High pressure and high temperature

The rod elongated by l when a body of mass M is suspended from it. Then what will be the work done?

1/2 Mgl

Mgl

2 Mgl

Zero

100 cm

40 cm

20 cm

50 cm

A book is lying on a table. What is the angle between the action of the book on the table and the reaction of the table on the book ?

180^{o}

30^{o}

0^{o}

90^{o}

A block of mass m is placed on a smooth inclined plane of inclination θ with the horizontal. What magnitude will the force exerted by plane on the block have?

mg

mg cos θ

mg / cos θ

mg tan θ

A man is sitting with folded hands on a revolving table. Suddenly, he stretches his arms. What would happen to the angular speed of the table?

Decreases

Increases

Remains the same

Nothing

Which of the following equations does not represent simple harmonic motion?

A rope 1 cm in diameter breaks if the tension in it exceeds 500 N. What will be the maximum tension that may be given to a similar rope of diameter 2 cm?

110 J of heat are added to a gaseous system and its internal energy increases by 40 J, then what will be the amount of work done?

A particle is moving along a circle of radius 20/π m with constant tangential acceleration. If the velocity of the particle is 80 m/s at the end of the second revolution after motion has begun, then what is the tangential acceleration?

160 π m/s^{2}

640 π m/s^{2}

40 π m/s^{2}

40 m/s^{2}

The rms speed of oxygen at room temperature is about 500 m/s. Then what will be the rms speed of hydrogen at the same temperature?

The time period of mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then what will be the new time period?

T / 2

2 T

T / 4

T

Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has a length 2 l and diameter r / 2. If the two wires are stretched by the same force, then what will be the elongation in A divided by the elongation in B?

1 / 8

1 / 4

4

8

A barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, what will be its reading ?

Where can a light wave travel?