Question # 1

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

In four stroke cycle the crank makes

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One complete revolution

Two complete revolutions

three complete revolutions

Four complete reveolutions

Light travels perpendicular to electric and magnetic fields and requires no material medium, was proposed by.

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Einstein

Max planck

Maxwell

Bragg

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

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-20

-40

20

40

Rainbows and mirage are formed by

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Reflection only

Refraction only

dispersion only

A combination of refraction, total internal refraction and dispersion

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

The negative of the potential gradient is

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Potential energy

Electrostatic force

Electric field intensity

Electromotive force

When the battery is being charged its terminal potential difference than its emf is.

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Less

Greater

Double

Squared root

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

Inductance are measured in

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Coulombs

Volts

Henrys

Farads

In a compound microscope magnification will be large if focal length of eyepiece is

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Large

small

Equal to that of the objective

Larger than that of the objective

A 4 kJ mass of copper of specific heat capacity of 400 J kg-1k-1 is heated for 160 s by a heater of power 200 W what is the rise in temperature.

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10 K

16 K

100 K

160 K

What happens when a 250 V, 2500 W water heater is connected to main supply using a plug fitted with a 5 A fuse.

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The fuse in the plug melts

The heartier burns out

The hearter runs at half power

The hearter works normally

The best instrument used for the measurement of emf of a cell a

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A voltimeter

An ammeter

A potentiometer

Wheatstone bridge

Para magnetism is.

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A distrotion effect

An orientation effect

A skin effect

A resistance

Thermocouple is used for

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Converting atomic energy into heat energy

Measure the radiant energy

Storing the heat energy

Measuring current

The magnitude of resultant of three force is 3. If its x-component is 2, Y component is 1. Its 2-component will be.

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1

2

3

4

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

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

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

Which type of oscillations produce resoncance.

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Free

Forced

Damped

All of these

When a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

One rem is equal to.

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0.1 Sv

0.01 Sv

0.001 Sv

0.0001 SV

If two gases have same reduced pressure volume and temperature it is according to

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Boyle's law

Charles law

Law of corresponding state

Zeroth law

If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

It is sometimes necessary to protect electrical apparatus from magnetic field This can be done by surrounding the apparatus with a box made from.

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Aluminum

Iron

Steel

Rubber

Lagging of magnetic flux density behind the magnetizing fled is known as.

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susceptibity

Diamagnetism

Hysteresis

Retentivity

Two stem engine A and B have their sources at 900 K and 600 K and their sinks are at 450 K and 300 K respectively.

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They are equally efficient

A is less efficient than B

a is more efficient than B

Their efficiencies cannot be determined

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