Question # 1

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

CRO deflects the beam of

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proton

a-particle

electron

neutron

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

The emf is measured in:

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Newton

Volt

J/C

Both A and B

Both B and C

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

The range of the diameter of core in multimode graded index fibre is

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50 to 100 μm

50 to 1000 μm

None of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

In petrol engine, the second stroke is the

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Compression

In take

Power

None of these

Ordinary light has components of vibration in

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One direction

Different direction

All directions

None of these

A ray of light passing from a rarer to a denser medium

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Bends towards normal

Bends away from normal

Suffers no change in direction

None of these

Light is a type of energy which produces sensation of

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Sound

Feeling

Vision

None of these

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

The SI unit of gravitational constant G is:

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m³kg^-1s^-2

m²kg^-2

Jmkg^-1

None of these

By convention, the torques are taken as positive if they are in the

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upward direction

rightward direction

clockwise direction

anticlockwise direction

Sharks due to their special organs, the "ampulae of lorenzini due to which they can detect the potential difference and can locate their prey very precisely of the order of

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Volt

Milli volt

Micro volt

Nano volt

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