Which one among the following statements is not correct?

• In progressive waves, the amplitude may be constant and neighboring points are out of phase with each other

• In the air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode

• A transverse wave can be polarized while longitudinal
  wave can not be polarized

• A longitudinal wave can be polarized while the transverse wave can not be polarized

332.

A body initially at rest is acted upon by a constant
force. The rate of change of its kinetic energy varies:

• linearly with square root of time

• linearly with time

• linearly with square of time

• inversely with time

A jet plane flies through the air with a velocity of 2 Mach. While the velocity of sound is 332 m/s the airspeed of the plane is:

• 166 m/s

• 66.4 km/s

• 332 m/s

• 664 m/s

Which one among the following statements is correct?

• Convex mirrors are used by doctors to examine oral cavity

• Concave mirrors are used as reflectors

• Convex mirrors are used as reflectors

• Convex mirrors should be used for shaving

Light travels in optical fiber irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of:

• diffraction of light

• refraction of light

• polarization of light

• total internal reflection of light

A man is at rest in the middle of a horizontal plane of a perfectly smooth surface of the ice. He can move himself to the shore by making use of Newton's:

• First law of motion

• Second law of motion

• Third law of motion

• First, second and third laws of motion

Which one among the following is the major cause of blurring and unsharp images of objects observed through a very large telescope at the extreme limit of magnification?

• Air turbulence of earth's atmosphere

• Poor optical polish achievable on large mirrors

• Poor tracking capacities of telescopes

• Varying density of air in the Earth's atmosphere

Bats can ascertain distances, directions, nature, and size of the obstacles at night. This is possible by the reflection of the emitted:

• ultrasonic waves from the bat.

• ultrasonic waves from distant objects.

• supersonic waves from the bat.

• supersonic waves from the distant objects

When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by:

• the theory of relativity

• Newton's first law

• Newton's second law

• Newton's third law.

The material used for electric fuse is an alloy of tin and lead. This alloy should have:

• high specific resistance and low melting point

• low specific resistance and high melting point

• low specific resistance and low melting point

• high specific resistance and high melting point.