Question # 1

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

______ plays the same role during angular motion as played by the mass in linear motion

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Torque

Angular Momentum

Moment of a force

Moment of inertia

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

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 velocity is zero

none of them

both of them

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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plastic line

breaking point

proportional limit

none of them

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

A spring of constant k = 0.4 N m^-1is to be extended through 10 cm at a place where g = 10 m sec^-2. The mass to be suspended should be:

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4 gms

0.4 gm

40 gms

None of these

The axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

Approximate power of a pocket calculator in watts

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7.5 × 10²

7.5 × 10^-2

7.5 × 10^-4

7.5 × 10^-5

The centre of gravity of an object is

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The point at which the gravity not acts

The point at which the total torque is minimum

The geometrical centre of the body

The point at which the weight of the object seems to act

In a uniform circular motion (horizontal) of a ball tied with a string,velocity at any time is at any angle θ is

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θ = 60°

θ = 30°

θ = 90°

None of the above

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

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Initial velocity

Variable velocity

Average velocity

None of these

Spokes used in a bicycle wheel increase its

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Moment arm

Moment of inertia

Acceleration

Velocity

For the monochromatic beam of X-rays, the crystal planes in a lattice act like a

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perfect absorbers

boundary

mirror

none of them

The more viscous liquids is

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Coal tar

Honey

Kerosene oil

Water

A 1500 kg car has its velocity reduced from 20 ms^-1 to 15 ms^-1 in 3.0 S. How large was the average retarding force

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- 4.5 KN

- 2.5 KN

- 3.7 KN

- 4.3 KN

Which does not show polarization

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Longitudinal wave in gas

Transverse wave in gas

Both a and b

None of these

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

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