Physics

If an object moves with constant velocity,

• It must have constant direction

• None of these

• It must have constant speed

• It must have constant speed in constant direction

Which of the following is not a form of Energy?

• Sound

• Heat

• Pressure

• Motion

The dimension of which of the following is the same as that of impulse ?

• Momentum

• Change in the rate of momentum

• Torque

• Volume

Momentum is measured as the product of :

• Mass and acceleration

• Mass and inertia

• Mass and velocity

• Mass and force

The wavelength at which the peak of intensity of blackbody radiation occurs

• Increases with increase in temperature

• Does not follow any pattern as temperature changes

• Is the same at all temperatures

• Decreases with increase in temperature

A single fixed pulley is used to draw water from a well because

• Efficiency is 100%

• Velocity ratio is low

• Mechanical advantage is high

• Force is applied in a convenient direction

The SI unit of luminous emittance is :

• Lumen second

• Lumen

• Candela

• Lux

The freezing point of fresh water is ________ .

• 0°C

• 4°C

• 3°C

• 5°C

The rotational effect of a force on a body about an axis of rotation is described in terms of

• Centrifugal force

• Moment of force

• Centre of gravity

• Centripetal force

Who gave the Theory of Relativity?

• Archimedes

• Galileo Galilei

• Isaac Newton

• Albert Einstein