Question # 1

Which of the following is its own anti particle.

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Photon

Electron

Proton

positron

Which electrical component may be used to store electrical energy in a time delay circuit

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Capacitor

Light dependent resistor

Resistor

Thermistor

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

The ideal thermal efficiency of a cyclic heat engine is limited by

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Friction in the engine

Amount of heat in the engine

Difference between input temperature and output temperature.

Amount of work

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

Permanent change in shape or size of a solid body without fracture resulting from the application of strained stress beyond the elastic limit is called.

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Elastic limit

Plastic limit

elastic deformation

Plastic deformation

The relation between work function and maximum energy of photo electrons was discovered by.

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Stefan

Marely

Einstein

Max. Planck

Which we double the voltage in a simple electric circuit, we double the

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Current

Power

Resistance

Both a and b

The dimensions of force are.

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[MLT-2]

[MLT-1]

[M,-1T-2]

[M-2T-2]

The relation between the voltage and current that flows in a resistor is.

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V = 1/R

R = vi

V = I2 R

I = V /R

When we decrease the diameter of the objective lens of a telescope the resolution of telescope

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Increases

Decreases

Remain the same

Depends upon the focal length of the lens

Which gas strictly obeys gas laws.

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Hydrogen gas

Inert gas

Ideal perfect gas

Helium gas

Electrical energy is transmitted at high alternating voltages which of the following is not a valid reason for doing this.

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At high voltage a.c is safer than d.c.

For a given powers, there is lower current with higher voltage.

There is a smaller energy loss at high voltage and lower current

The transmission lines can be thinner with a lower current.

In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called.

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Electric potential

Electric fierce

Electric charge

Magnetic force

The SI unit of impulse is.

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N m

N s

Kg ms -1

Both b and c

Out of the following pairs, which one does not have te same dimensions.

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Force and weight

Pressure and stress

Energy and work

Momentum and torque

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

Which Isotopes is use din radioactive dating.

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C¹²

C¹³

C¹⁴

C¹⁶

In an Isolated system , total energy of the vibrating's mass and spring is

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Low

High

Constant

Variable

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

The SI unit of strain is

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N m-1

N m-2

N m

It has no unit

The extension produced in a sample of material depends upon

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Nature of the material

Stretching force

Cross range order

All of the above

A particle executing simple harmonic oscillations of frequency 100 Hz has an amplitude of 0.1 cm The velocity amplitude of the particleis.

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20 micro cm s-1

10 micro cm s-1

20 cm s-1

19 cm s-1

An ideal engine can be 100% efficient only if its exhaust temperatute.

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Equal to input temperature

Less than is input temperature

More than its input temperature

0 ^oC

The magnitude of induced emf during electromagnetic induction is controlled by.

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Magnetic flux

electric flux

Electric field

Magnetic field

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

A body of mass 1 kg hanging with a spring of spring constant 60 N m-1 is rotation in a horizontal circle The values of angular frequency will be.

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80 .94 Hz

89. 4 Hz

98. 4 Hz

108 . 6 Hz

The mass defect of Bohr's atomic model is

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Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

The emission of photons by a metal when electrons are incident is called.

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Photo electric effect

Pair production

X-rays production

Gama ray production

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