Question # 1

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

Which term is used for the persistence of sound in a hall.

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Resonance

Acoustics

Symphony

Reverberation

who discovered taht mass and energy are forms of each other.

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Issac Newton

Albert Einstein

Galileo

Khawarizmi

The frequency of the fundamental mode of transverse vibration of a stretched wire 1,000 mm long is 256 Hz When the wire is shortened to 400 mm at the same tension

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640 Hz

680 Hz

720 Hz

780 Hz

The hyperfine lines in the spectrum relates to

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Stark effect

Zeeman effect

Lande's spliting

Nuclear magnetic spin

Which is the branch of medicine that deals with the anatomy physiology and diseases of the eye.

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Ophthalmology

Psychology

Andrology

Gynecology

The output of two input OR gate is zero only when its.

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Either input is one

Either input is zero

Both inputs are zero

Both inputs are one

Which of the following is deflected by an electric field.

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Alpha particles

X rays

Gama rays

Neutrons

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

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

An electrical source with internal resistance's' is said to operate a lamp of resistance R what fractions of the total power is delivered to the lamp.

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R+r/R

R-r/R

R/R+r

r/R-r

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

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Conduction

Convection

Radiation

None of these

Iron loss in a dynamo arises because of.

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The resistance of armature coil

The production of eddy current

The presence of mechanical friction

The leakage of flux

The negative of the potential gradient is

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Potential energy

Electrostatic force

Electric field intensity

Electromotive force

The moment of inertia of a body comes in action in

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Circular motion

Straight line motion

Curved path

zig zag motion

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

Who discovered neutron in 1932.

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Chadwick

Bohr

Rutherford

Fermi

Shadow formation and the pin hole camera illustrate the

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Phenomenon of reflection

Phenomenon of refraction

Phenomenon of total internal reflection

Rectilinear propagation of light

Which quantity provides a quantitative measure of disorder.

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Entropy

Enthalpy

Randomness

Chaos

What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased.

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It decreases

It increases

It remains the same

It may increase or decrease

Who explained Browian movement quantitatively.

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Issac Newton

albert Einstein

James Maxewll

Robert Brown

When damping is small amplitude of vibrational resonance will be

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small

Large

Infinite

Un changed

The magnus effect is equivalent to

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Bernouli's theorem

Archimedes principle

Pascal's law

Blood pressure

The critical mass of fissionable uranium -235 can be reduced by

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Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

The centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

In a fission reactor which particle causes a uranium -235 nucleus to split.

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Alpha particle

Gama ray

Neutron

Proton

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

Which is the fundamental quantity in electrostatic.

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Electric charge

Electric potential

Electric field

Electric field intensity

A ball is thrown straight up What is its acceleration just before it reaches the highest point.

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Zero

slightly less than g

Exactly g

Slightly greater than g

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