Question # 1

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

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

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

Centripetal acceleration is also called ______ acceleration

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Tangential

Radial

Angular

None of them

The flow of an ideal fluid is

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streamline flow

incompressible flow

non-viscous

all of the above

Fluids resist force, This property is called

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Stiffness

Strength

Ductility

Elasticity

In the force applied to parallel to the direction of motion, then the work done is:

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Positive

Negative

Zero

None of these

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

The law of electromagnetic induction is related to:

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Coulomb

Ampere

Faraday

Lenz

None of these

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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3/5 ohm

2 ohm

6/5 ohm

3 ohm

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angel as well as velocity of projection

Minimum number of unequal forces whose vector sum can be zero is

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3

4

2

5

The equation of continuity of fluid is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

All of these

Ray optics is valid,when characteristic dimensions are

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Of the same order as the wavelength of light

Much smaller than the wavelength of length

Of the order of one millimeter

Much larger than the wavelength or light

For a normal AC cycle, during T/2 to T the diode act as:

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Open switch

full wave rectifier

Close switch

All are correct

In coordinate axes, the left ward forces are taken as

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Positive

Negative

Just units only

None of these

Unit of angular displacement is

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Degree

Revolution

Radian

All

Large CR (Time constant) value has

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Small time constant

Large time constant

Equal time constant

None of these

Fire optics has ability to transmit

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Thousand telephone conversation

Several television programs

Numerous data signals between stations

All of these

The practical use of services by optic fiber is

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Two way television

World processing

Image transmitting and receiving equipment

All of these

In YDS experiment, data given isλ= 500 nm, L = 100 cm,Δy comes out to be

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0.5 cm

0.5 mm

0.5 nm

0.5 m

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