Question # 1

The r.m.s value of a.c. current is always

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positive

negative

zero

all of these

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

Maximum work is done when force and displacement are

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Parallel

Antiparallel

Perpendicular

Both a and b

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

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dead beat galvanometer

stable galvanometer

shunt galvanometer

sensitive galvanomter

Drag force on a falling ball depends upon

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Size of the body

Shape of the body

Orientation of the body

All of these

No work is done by the body when angle between force and displacement is

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0^o

45^o

90^o

60^o

The Bernoulli's equation often expressed in

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The ratio of electro static force to the gravitational force between them is of the order of

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10³⁶

10³⁸

10⁴⁰

10⁴²

A cable breaks if stretched by more than 2 mm.It is cut into two equal parts.How much either part can be stretched without breaking?

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0.25 m

0.5 m

1 mm

2 mm

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

An oil surface floating on water surface exhibits beautiful colour patter, which is due to

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Reflection of light

Diffraction of light

Interference of light

None of these

The phenomenon is found to be prominent when size of the opening (aperture) is

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Grater than wavelength of light

Smaller than wavelength of light

Equal of light used

None of these

A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called

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Step index fibre

Multimode step index fibre

Multimode graded index

None of these

If the distance between two masses is doubled, the gravitational attraction between them

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Is doubled

Becomes four times

Is reduced to half

Is reduced to a quarter

The product of force and time is called

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Momentum

Force

Impulse

None of these

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