Question # 1

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

Direction of motion _________ in circular motion

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Changes off and on

Changes continously

Does not change

None of them

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

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2.120°A

0.212°A

21.2°A

0.14°

a

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

The resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

The value of escape velocity of Earth planet comes out to be:

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11 m/sec

11 km/sec

11 km/hour

11 cm/sec

When a falling body hits ground, its KE changes to _____ energy.

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Potential

Chemical

Mechanical

sound and heat

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

When a conductor moved with its length parallel to the lines of magnetic fled:

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An emf is induced across its ends

Emf induced is similar to that of a battery

Emf passes through the conductor

Both A and B

None of these

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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adiabatically

isothermally

isochorcally

isobarically

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

Ohm is the unit of

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current

capacitance

energy

resistance

NmA^-1is commonly called:

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Weber

Apmere

Guass

Coulomb

None of these

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

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Charge Q

Potential V

Capacity

Energy U

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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high - low

yes - no

on - off

0 - 1

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

When current passes through a solenoid coil, it behaves like a

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loop

circle

bar magnet

none of these

On colliding in a closed container, the gas molecules

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Transfer momentum to the walls

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

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