Question # 1

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)

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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ON switch

off switch

function switch

none of these

If we draw a graph between d (along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis, then area under this straight line represents:

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Power

Work

Pressure

None of these

In the resonance condition, the amplitude of the oscillator becomes

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very large

very small

zero

any one of them

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

Which of the following material has longer half life

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radium

polonium

radium

uranium

When two lights waves travelling in the same direction are in phase at any point, they producing

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constructive interference

destructive interference

dispersion

polarization

The torque is maximum when the angle between F and r is

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0^o

90^o

180^o

275^o

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

The dimensions of torque is

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[MLT^-2]

[ML²T^-2]

[ML²T^-1]

[MLT]

In case of destructive interference of two waves, the amplitude of the resultant wave will be ______ either of the waves

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Greater then

Smaller then

Equal to

None of these

Inverting amplifier circuits have

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A very high input impendance

A very low input impendance

A low output impendance

Both A and C

A person walks first 10 km north and 20 km east.then the resultant vector is

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22.36 km

22.46 km

25.23 km

20.36 km

If the focal length of the eye piece 25.0 mm find its magnification

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12.0

14.0

- 11.0

- 13.0

The equation W = ________𝜟U represents:

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Thermal process

adiabatic process

Isobaric process

None of these

The velocity-time graph of a car is a straight line which rises the same height for equal intervals of time, if it moves with

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zero velocity

constant velocity

zero acceleration

constant acceleration

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