Question # 1

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

Gamma rays consist of steam of

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electron

proton

photons

all of these

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

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

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maximum

zero

minimum

not fixed

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

In a normal healthy person the value of diastolic pressure is

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75 - 80 torr

100 torr

120 torr

none of them

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

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Choke

impedance

Semi-conductor

None

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

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

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decrease

increase

same

none of these

The work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

The Boltzman constant has the value

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1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

In SHM, the acceleration is ______ when velocity is _____:

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Zero, smallest

Smallest, zero

Zero, zero

Zero, greatest

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

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