Question # 1

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

The mechanics, which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanic

Quantum mechanics

Statics

The value of the Stephen's constant for black body radiations is given by

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5.6 x 10⁸Wm^-2K^-4

5.67 x 10^-8Wm^-2K^-4

2.9 x 10^-3mK

2.9 x 10³mK

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is

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0.5 J

2 J

0.25 J

1 J

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

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Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

The body passing a viscous medium affected by:

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One force only

Two forces only

Four forces

None of these

Escape velocity from surface of Moon as compared to that from Earth surface is:

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Greater

Smaller

Equal

None of thes

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

A laborer carrying a load on his head moves from the rest on a horizontal road to another point where he comes to rest. He has done:

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Minimum Work

Maximum Work

Zero Work

Negative Work

In order to produce pair production, a photon must have a energy

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0.511 Me v

0.256 Me v

1.02 Me v

0.956 Me v

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

The neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

If x-component of a vector is -3 N and y-component is 3 N, then angle of resultant vector will x-axis is:

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45°

315°

135°

225°

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

The waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

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