Question # 1

The force experienced by an electron projected in a magnetic field B with a velocity V is given by

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F=e(V x B)

F= -e(V x B)

F= e(B x V)

Both a and c

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

When the conductor moved across a magnetic field:

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Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

None of these

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

By convention, torques producing clockwise rotation are taken as:

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Positive

Nagative

Zero

None of these

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

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Frequency

Half life

Year

Mean life

None of these

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

If P is the pressure of gas than K.E per unit volume of gas is

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P/2

P

3/2 P

2P

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

If no external torques act, the angular momentum of a body rotating about a fixed axis in two dimensions is

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Variables

Constant

Non conserved

None

Which of the following is not true for a crystalline substance

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Shorter range order

Isotropic electrical conductivity

Flat surface

Sharp melting point

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

In semiconductor Si or Ge a missing electron in covalent bond from an atom is a

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Charged atom

Hole

Ion

All of them

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

The polymeric solids have specific gravity compared with even the lightest of metals

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Low

Very Low

Slightly low

None of these

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

The height at which the satellite stay directly above a particular point on the surface of the earth above the equator is

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24000 km

36000 km

42000 km

None of these

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