PHYSICS QUIZ | EXAMIANS

A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

More than one

Less than one

Zero

One

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YOUR ANSWER : ?

Which of the following properties is found only in ferromagnetic materials ?

Susceptibility independent of temperature

Point in a particular direction

Attracting a magnetic substance

Hysteresis

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Plants are dried up in winter due to frost because

Respiration does not take place at low temperature

Evaporation does not take place

There is mechanical loss of tissues and drought condition prevails

Photosynthesis does not take place at such low temperature

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Velocity of sound in air does not depend on

Pressure of air

Density of air

Temperature of air

Humidity of air

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A gradual increase in loudness is known as

None of these

Timbre

Crescendo

Fortissimo

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If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

LUV > lIR > lVIS

LUV < lVIS < lIR

LUV > lVIS > lIR

LUV < lIR < lVIS

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Which measurement describes the pressure of a gas?

450 mm Hg

315 K

251 g/cub.cm

None of these

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Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.

Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

Action of ultraviolet light from the sun on atmospheric oxygen.

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.

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The strength of an electromagnet can be increased by

Increasing the length of the coiled wire

Increasing the number of turns

Increasing current supply

All of these

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Why does water tank appear shallower when viewed from the top?

Due to refraction

Due to diffraction

Due to reflection

Due to total internal reflection

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