Question # 1

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

The SI unit of gravitational constant G is.

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kg m-1 s-1

kg m2 s-2

kg m3 s-2

kg m2 s-1

a body floats in liquid contained in a beaker The whole system falls freely under gravity The outthrust on the body due to liquids is

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Zero

Equal to the weight of the body in air

Equal to the weight of the liquid displaced

Equal to the weight of the immersed portion of the body

A spectroscope sorts out

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Atoms

Molecules

Elements

Isotopes

The eight most common element in the universe by mass is

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Ge

C

Si

As

If temperature of the sink is decreased the efficiency of a Carnot engine

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Increases

Decreases

Remains constant

First increases and thend ecreases

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

Difference in the density of two medium when waves are passing from one into another medium always results in the change in.

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Wave speed

Wave direction

Both speed and direction

Wave frquency

When stationary waves are formed in a closed organ pipe.

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A node is formed at the closed end of the pipe

An antinode is formed at the closed end of the pipe

Each particle at the node experience zero acceleration

The maximum pressure occurs at the nodes

The amplitude of a vibrating body at resonance place in vacuum is.

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zero

Maximum

Minimum

Infinite

In general work done on or by a gas depends on.

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The initial state only

The final state only

The initial and final states

The initial state the final state and the path

If the source of emf is traversed from negative to positive terminal the potential charge.

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Is negative

Is positive

Is zero

Remain the same

Which of the following is conserved in SHM

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K.E.

P.E

Total energy

Electrical energy

In solid and liquids the variation of the speed of sound with temperature is.

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Much greater than in air

Slightly les than in air

The same as in air

Smell and usually negligible

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

An example of simple harmonic motion is

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Fast moving cricket ball

Motion of bicycle

Motion of a bee

Motion of simple pendulum

The reverse process of vector addition is called

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Negative of a vector

Subtraction of vectors

Resolution of vectors

Multiplication of vector

At room temperature the potential difference between the two sides of depletion region for silicon is of the order of.

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0.3 v

0.5 V

0.7 V

0.9 V

use of outer layer in optical fires called cladding is mainly to.

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Scatter thelight

Absorb unwanted light

Transmit the light

Produce total internal reflection

The band width of an audio amplifier is.

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10 Hz to 10 kHz

20 Hz to 54 Hz

20 Hz to 20 kHz

20 Hz to 60 kHz

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

The main causes of power losses in a generator are.

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Pulsatng current

Eddy current

Magnetic current

Both B and C

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

A 10 kg rocket fragment falling towards the earth has a net downward acceleration of 5 ms -2 The net downward force acting on the fragment is

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5 N

10 N

50 N

105 N

Materials that experience a force from stronger to weaker regions of magnetic field are called.

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Non magnetic

Paramagnetic

Ferromagnetic

Diamagnetic

An electric lamp use energy at the rate of 46 W on a 12 V supply. How much charge passes through the lamp in 2s.

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0.15 C

0.50 C

2.0 C

8.0 C

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

The 1st condition of equilibriums satisfied if.

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Linear acceleration is zero

Angular acceleration is zero

The vector sum of all the forces is zero

The vector sum of all the torque is increase

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

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150 W

500 W

1,000 W

2,000 W

The core of a transfer is made of iron because

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Iron is a good electric material

Iron is cheaper than copper

Iron is easily magnetized and demagnetized

Iron makes a good permanent magnet

Which is the light sensitive tissue in human eye

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Retina

pupil

Iris

Cornea

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