Question # 1

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

In a R-L-C series circuit, when the frequency of A.C. source is high the circuit is.

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R-L Circuit

R-C circuit

L-C circuit

R-L or R-C

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

Which of the following phenomenon occurs when two sound waves of equal amplitude and different frequencies travel through the same region.

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Resonance

Beats

Echo

Doppler's effect

As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf.

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diverges

Converges

is neutralized

Is unaffected

Huygen's principle is used to explain the

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Speed of light

Dispersion of light

Propagation of light

Reflection of light

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

The SI unit of impulse is.

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N m

N s

Kg ms -1

Both b and c

Where is the velocity of electrons maximum in a diode.

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Near the cathode

Near the anode

In the space ini between the two elecrode.

It is same throughout the tube

Who was the author of Mathematical principles of Natural philosophy.

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Kepler

Einstein

Max Planck

Newton

Lissajou's figures are used in a Cathode Ray Oscilloscope while measuring.

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Time period

Frequency

Voltage gain

phase angle

In a nuclear reactor chani reaction is controlled by introducing.

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Iron rods

Cadmium rods

Graphite rods

Platinum rods

A man in an elevator ascending with an acceleration will feel that his weight.

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Has increased

Has decreased

Remains the same

Vanishes

Density of blood a

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Equal to water

Greater than water

Less than water

zero

The two elements with same number of electrons but different mass number are called.

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Isotones

Isobars

Isotopes

Isomers

A spring obeying Hooke's law has an upstretched length 50 mm and a spring constant of 400 N m-1 What is the tension in the spriing when its overall length is 70 mm.

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8 N

28 N

160 N

400 N

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

Push pull amplifiers employ

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One transistor

Two transistors

Three transistors

Four transistors

A solid state detector is basically

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A reverse biased p-n junction

A forward biased p-n junction

A p-n -p transistor

A n-p-n transistor

An electric current in conductors is due to the flow of.

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Positive ion

Negative ion

Positive charges

Free electrons

By placing soft iron inside a coil

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Increases the magnetic flux

Decreases the magnetic flux

Creates no change in magnetic flux

Decreases the diameter of the core

The sensitivity of the galvanometer can be increased by increasing the

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Number of turns of the coil

Area of the coil

Strength of the magnetic field

All of the above

When an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called.

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Reflection

Refraction

Diffusion

Diffraction

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

Natural radioactivity was discovered in.

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1978

1896

1904

1906

Rate of flow of a liquid is expressed in

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Litre m-3

Litre s-1

Litre m-1

Litre s

Davison and Germer received the Nobel Prize in

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1929

1931

1935

1937

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

If a di electric is placed between the plates of a capacitor, its capacitance.

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Decreases

Increases

Remains unaffected

Is zero

The efficiency of a diesel engine is about

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15% to 35 5

355 to 40%

45% to 655

505 to 65 %

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