Question # 1

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

The energy of the 4th orbit in hydrogen atom is

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2.5 ev

- 3.5 ev

-0.85 ev

-13.6 ev

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

Which quantity has different dimension?

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Tension

Work

Energy

Torque

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The area under line velocity-time graph is numerically equal to the

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speed of the body

acceleration of the body

distance covered by the body

none of them

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

Silicon can be obtained from:

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Lead

Uranium

An isotope of oxygen

Sand

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

Galvanometer is a device used for the detection of

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voltage

current

temperature

pressure

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

When a body moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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Yellow

Orange red

Dull red

White

Cherry red

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