Question # 1

The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it

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h/mv

hm v

mh/v

m/hv

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

A pendulum clock set to give correct time in Karachi is taken to Quetta it would give correct time if

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The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum os increased

The length of the pendulum is decreased

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude then their magnitude are:

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3, 15

4, 14

5, 13

6, 12

The number of translation degrees of freedom for a diatomic gas is

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2

3

5

6

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro -magnetic energy

The velocity v of a particle at time t is given by:

v = at + b / t + c

The dimensional formula of a,b and c care respectively:

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L² ; T and LT²

LT² ; LT and L

LT^-2; L and T

L;LT and T^-2

The angle between rectangular components of a vector is

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0°

60°

90°

120°

How much water a pump of 2kW can raise in one minute to a height of 10 m. take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

The velocity of falling raindrops attains limited value because of

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Up thrust of air

VIscous force exerted by air

Surface tension effect

Air currents atmosphere

A prism splits a beam of white light into its seven constituent colors this is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β). The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆C¹³

Which of the following lists of physical quantities consists only of vectors:

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Time, temperature, velocity

Force, volume, momentum

Velocity, acceleration, mass

Force, acceleration, velocity

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will becomes less intense

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

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