Question # 1

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

Amplitude is the displacement of the vibrating body from:

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One extreme position to the other extreme position

Mean position any one extreme position

Both A and B are correct

None of these

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

The branch of physics, which deals with the structure an properties of solids is called:

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Plasma physics

Solid state physics

Any of above

Astro physics

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

OP-AMP has the following input terminals

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one

two

three

four

As the current flows through the wire

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decrease

Voltage across the ends is the increase

None of these

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

For a given angle of projection if the time of flight of a projectile is doubled the horizontal range will increases to:

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Four times

Thrice

Once

Twice

A beam of light enters air from water.Which of the following characteristics of light will not change in water?

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Frequency

Wavelength

Velocity

Amplitude

If the light travels in a straight line, the central region should appear

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Bright

Dark

No effect

None of these

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average displacement is zero

none of them

both of them

The direction of torque is

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Along F

Along r

Perpendicular plant formed by F and r

None of these

In an isothermal process

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Volume remains constant

Pressure remains constant

Temperature remains constant

None of these

The concentration in solution can be determined by the property known as

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Solubility

Insolubility

Optical activity

None of these

Numerical value of magnitude of a physical quantity is

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Independent of system of units

Directly proportional to magnitude of the unit

Inversely proportional to magnitude of the unit

Either (B) or (C)

The method by which only one half of A.C cycle is converted into direct current is called

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half wave amplification

half wave rectification

Full wave rectification

full wave amplification

The units of modulus of elasticity are

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Nm^-2

Nm²

Torr

Both B and C

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