Question # 1

What is used in an electric circuit to allow current in one direction only.

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A fuse

An ammeter

A diode

A relay

The value of electric field intensity is.

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Volt

Coulomb

Newton

Newton coulomb

The minimum amount of energy in an individual electron has to gain to escape from a particular surface is called.

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Threshold frequency

work function

Wave number

Kinetic energy

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

At which temperature a ferromagnetic material is converted into a paramagnetic one.

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curie temperature

Boyle's temperature

Natural temperature

Neutral temperaturre

The phenomenon of beats takes place due to

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Longitudinal waves

Transverse waves

Stationary waves

Both a and b

What is the energy equivalent to amu in Me V

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0.931 MeV

9.31 MeV

93.1 MeV

931 MeV

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

Two tuning forks have same natural frequency One of them is now loaded with wax. When both the forks are sounded together the will

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Produce interference

Produce vibrations

Remain in resonance

Produce beats

Why a positively charged object is made neutral by someone touching it.

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Electrons flow from the object

Protons flow onto the object

Protons flow from the object

Protons flow onto the object

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

Woolen clothing a effective in keeping us warm because.

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An trapped int he wool acts as an insulator

Heat loss by convection and radiation is prevented

Wool is bad traciator and good absorber of heat

Wool can retain high temperatures

Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other.

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Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

The image formed by a projector is

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Real, inverted and enlarged

Real, upright and enlarged

Real ,inverted and diminished

Virtual, upright and diminished

Because of second law of thermodynamics about the direction of energy flow what is possible.

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Heat

Light

Energy

life

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

They hysteresis losses are eliminated in power transformer by using

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Low resistivity power winding

Low reflectance steel cores

Laminated steel cores

soft iron cores

The amount of charge which can be placed on a conductor does not depend on.

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The dielectric strength of the surrounding medium.

Its capacitance

Its potential

Its size or shape

Interference effects of light were verified by

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Thomas Young

Newton

Bragg

Huygen

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 power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

The strength per unit volume of a solid is called.

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shear stress

Shear strain

Bulk strength

Bulk modulus

For maximum range angle of projection of the projectile should be

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45 ^o

90^o

120 ^o

180 ^o

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

Two electrons approach each other their relative velocity will be.

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Zero

c

c/2

Infinity

When a fluid in a cylinder expands through a distance 'd' against a piston of area 'A' which is exerting a constant pressure 'P' the work done is equal by.

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PAD

PA/d

Pd/A

Pd/A2

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

The equation of parabola is.

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y= bx - ax2

x = by - ay2

y = ax + bx2

x = a -by2

The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.

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It remains the same

It increases by a factor of 2

It increases by a factor of 4

It increases by a factor of 8

A rocket propulsion is based on the principle of.

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Conservation of momentum

Conservation of mass

Conservation of energy

Floatation

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