Consider the following statements :1. There is no net moment on a body which is in equilibrium.2. The momentum of a body is always conserved.3. The kinetic energy of an object is always conserved.Which of the statements given above is/are correct?

Physics
Consider the following statements :1. There is no net moment on a body which is in equilibrium.2. The momentum of a body is always conserved.3. The kinetic energy of an object is always conserved.Which of the statements given above is/are correct?

2 and 3 only

1, 2 and 3

1 and 2 only

1 only

2 and 3 only

1, 2 and 3

1 and 2 only

1 only

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Physics
A small gap is left at the joints of rails in a railway track to

Control the speed of train

Keep the rails equidistant

Avoid the heating of tracks to high temperature

Avoid the tracks being distorted due to seasonal temperature variation

Control the speed of train

Keep the rails equidistant

Avoid the heating of tracks to high temperature

Avoid the tracks being distorted due to seasonal temperature variation

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals

Plastics have a higher thermal conductivity than metals

Metals have higher thermal capacity than plastics

Metals are good conductors of heat

Plastics have a lower density than metals

Plastics have a higher thermal conductivity than metals

Metals have higher thermal capacity than plastics

Metals are good conductors of heat

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Physics
Danger signals are generally red as red light

Gives comfort to eye

Undergoes least deviation

Is least bright

Has lowest velocity

Gives comfort to eye

Undergoes least deviation

Is least bright

Has lowest velocity

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Physics
Convex mirrors are used as a rear view mirror in motor cycles because

All of these

It forms smaller image as compared with object

It forms real image

It forms erect (upright) image

All of these

It forms smaller image as compared with object

It forms real image

It forms erect (upright) image

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Physics
Which one of the following is the value of one nanometer?

10-4 cm

10-6 cm

10-3 cm

10-7 cm

10-4 cm

10-6 cm

10-3 cm

10-7 cm

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Physics

Physics Consider the following statements :1. There is no net moment on a body which is in equilibrium.2. The momentum of a body is always conserved.3. The kinetic energy of an object is always conserved.Which of the statements given above is/are correct?

Physics A small gap is left at the joints of rails in a railway track to

Physics On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Physics Danger signals are generally red as red light

Physics Convex mirrors are used as a rear view mirror in motor cycles because

Physics Which one of the following is the value of one nanometer?

Physics
Consider the following statements :1. There is no net moment on a body which is in equilibrium.2. The momentum of a body is always conserved.3. The kinetic energy of an object is always conserved.Which of the statements given above is/are correct?

Physics
A small gap is left at the joints of rails in a railway track to

Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Physics
Danger signals are generally red as red light

Physics
Convex mirrors are used as a rear view mirror in motor cycles because

Physics
Which one of the following is the value of one nanometer?