Question # 1

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

LDR can act as:

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Diode

Switch

Transistor

Rectifier

The converter of digital to analogue signal is:

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ADC

DAC

DATC

DTC

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

The refractive index of ice is:

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1.00

1.33

1.31

2.42

electric field is weak when:

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lines are far apart

lines are close together

no lines are present

lines are directed outside

When a potential of 10 volt is applied across a conductor, a current of 5 miliampere flows through it, the resistance of the conductor will be:

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200 ohm

2000 ohm

0.2 ohm

0.002 ohm

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

The end of solenoid from which lines of force emerge out is called:

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North pole

South pole

North and south pole

None of these

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

The ratio of external force applied on the spring to displacement is called:

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Hook's law

Constant

Spring constant

The speed of sound is air at 21 ^oC is:

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336 ms^-1

343 ms^-1

430 ms^-1

470 ms^-1

the time period of body attached to spring depend on:

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mass

gravitational constant

length

amplitude

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