Question # 1

The flux through a closed surface depends upon:

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Shape of geometry of the closed surface

Charge enclosed

Nature of the medium

Both (A) and (B)

Both (B) and (C)

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

The principle characteristics of an ideal standard are

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Inaccessible and Invariable

Accessible and Invariable

Accessible and Variable

None of these

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic feild

Constant electric field

None of these

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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V/e

eV

e/V

V

The driection of vector si space is specified by:

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One angle

Two angles

Three angles

None of above

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron hole is generated

all of them

In Young s double slit experiment if we use white light then

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Colored fringes will be observed

Bright fringes will be observed

Alternate dark and bright fringes will be observed

No interference fringes will be seen

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

A uniform beam of weight 100 N is 4 m long and is supported 1.0 m from one end. A load of weight wN hangs from that ened and the beam is in equilibrium.What is the value of w?

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50 N

75 N

100 N

200 N

A point source in a homogeneous medium gives rise to:

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A plane wavefront

A spherical wavefront

A cylindrical wavefront

An elliptical wavefront

Zero error of the instrument is a type of _____

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Random error

Personal error

Systematic error

Classified error

At constant temperature, if the density of the gas is increased, its pressure will:

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Decrease

Increase

Remain unchanged

None of these

In Bernoulli's equation, the work done due to fluid is

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The correct statement about poissons ratio is

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Its unit is N/m²

It is dimensionless

Its unit is Newton

Its dimensions MLT²

The distance between different interference fringes are:

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Variable

Same

Different

None of these

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

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