Question # 1

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Examples of crystalline solids are:

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Cooper

NaCl

Zirconia

Both (A) and (B)

All of these

If a gymnast 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

Remain constant

None of these

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

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64 W

80 W

100 W

125 W

The expression of Hook's law is

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F=ma

F=kx

F= -kx

-kx=ma

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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6 ohm

4 ohm

zero ohm

1.33 ohm

The Dimension of acceleration is

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[L²T]

[LT²]

[LT^-2]

None of these

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When a stress changes its length, it is called

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Stress

Tensile stress

Shear stress

None of these

When the deformation produced in the material becomes permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

IF the spinning speed of the earth is increased then the weight of the body at equator

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Does not change

Doubles

Decreases

Increases

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

In a compound microscope the intermediate image is

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Virtual erect and magnified

Real,erect and magnified

Virtual,inverted and magnified

Virtual,erect and reduced

The energy stored in a wound watch spring is

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K.E

P.E

Heat energy

Chemical energy

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

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