Question # 1

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

When there is no relative motion between the magnet and coil, the galvanometer indicates:

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No current in circuit

An increasing current

A decreasing current

Either B or C

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The unit of spring constant is:

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J-sec

Metre

Nm^-1

None of these

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

An ideal choke (used along with fluorescent tube) would be

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A pure resistor

A pure capacitor

A pure inductor

A combination of an inductor and a capacitor

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

For measuring the angle between two vectors graphically, we join:

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Tails of both the vectors

Tail of one vector with the head of other

Heads of both the vectors

None of these

When a shell explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

If the particle is moving in a circle of radius 'r' with uniform angular velocity ω. The angle between r and tangential velocity is

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0^o

90^o

180^o

270^o

Polymers have specific gravity which is:

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Low as compared to even the lightest metal

High as compared to the heaviest metal

Intermediate

Any of these

None of tese

The idea of light as wave produced by

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Huygen

Newton

Thomos Young

Michelson

The computer chips are made from

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Semiconductor

Conductor

Silicon

Sand

The ratio of volumetric stress to volumetric strain is called

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Young's modules

Bulk modulus

Shear modulus

Hooke's law

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

In closed end organ pipe, the frequency of first harmonic is 300 Hz. The frequency ofthird overtone is :

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900 Hz

1500 Hz

2100 Hz

600 Hz

Pressure exerted by a gas on the walls of its container is due to

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Adhesion between the gas molecules and the container

Cohesion between the gas molecules and the container

Collision between the gas molecules and the container

Surface tension of the gas

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Newton's third law also says that action and reaction forces always act on the

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Different bodies

Same bodies

Only one body

None of these

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