Question # 1

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

The SI unit of magnetic permeability is

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WB A^-1m^-1

WB mA^-1

WB Am^-1

None of these

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

Change in momentum is one second is called:

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Impulse

Force

Energy

Work

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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°

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

Which of the following material has longer half life

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radium

polonium

radium

uranium

A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:

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8.1 X 10⁷N

625 N

6250 N

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done in 25J. The angle which the force makes with the direction of motion will be

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60°

90°

30°

0°

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

None of these

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

The charge per unit time through any cross-section of a conductor is called

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capacitance

electric power

current

potential difference

G.P. Thomson observer experimentally that electrons and neutrons possess

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particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

A digital system deals with quantities which has discrete values:

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Two in number

One in number

Three in number

Four in number

None of these

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

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