Question # 1

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

The cohesive forces between atoms, molecules or ions in crystalline solids maintain the strict

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short range order

long range order

both of them

none of them

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

The space around the earth within it exerts a force of attraction on other bodies of known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3V

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

The re conversion of light signals into electrical signals takes place due to

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Transmitter

Receiver

Generator

None of these

A convex ens acts as diverging lens when the object is placed

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Between F and 2F

At 2F

Within the focal length

Beyond 2F

The viscosity of glycrine is

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0.019x10^-9 Nsm^-2

0.801x10^-6 Nsm^-2

6.29x10^-3 N-sm^-2

6.29x10³ Nsm^-2

Scientific notation which can be expressed in the

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Negative powers

Powers of ten

Decimals

None of these

Bodies falling freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

The modulus of rigidity of a liquid is

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Zero

1

Infinite

None of these

The Earth axis of rotation is

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Remains fixed

Remains fixed in one direction

Not fixed

None of these

The speed of light in vacuum or in air is

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3 x 10¹⁰ m ! s

3 x 10⁹ m ! s

3 x 10⁸ m ! s

3 x 10⁷ m ! s

The communication with any place on the surface of the Earth can be made by the wave/rays known as

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Infrared

Microwave

X-rays

Radio waves

If a dielectric is placed between the plates of a capacitor its capacitance will

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Increase

Decrease

Becomes double

None of these

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