Question # 1

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

Which of the following does not exhibit S.H.M?

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a plucked violin string

a mass attached to a spring

a train shunting between two terminals

a simple pendulum

Photoelectrons are emitted when ultraviolet light falls on:

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Casium

Silver

Potassium

Any of these

None of these

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

For a fixed force, larger is the mass of a body the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

Blood vessels can be stretch like rubber, therefore they are

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rigid

hard

very thick

not rigid

A monochromatic source of light gives light of

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one colour

two colours

four colours

seven colours

For a monochromatic light passing from air to glass, which one of the following statement is true?

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Frequency and wavelength decreases

Frequency increases and wavelength decreases

Frequency stays same, wavelength increases

Frequency stays the same, wavelength decreases

The energy associated with an electron of velocity 10⁶ m/s is:

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4.5 x 10^-10 J

4.5 x 10^-19 J

3 x 10^-10 J

3 x 10^-19 J

The typical example/examples of optically active crystals

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Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

The changes which involve friction or dissipation of energy are reversible through

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Conduction

Convection

Radiation

All of these

X-ray crystallography can be used to get what information about the structure of a compound?

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the bond angles in a molecules

the number of molecules per unit cell

a picture of the electron density in a unit

all of them

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

You are on a frictionless horizontal plane.How can you get off if no horizontal force is exerted by pushing against the surface?

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By jumping

By spitting or sneezing

By rolling your body on the surface

By running on the plane

The value of g is maximum at

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The equator

The poles

The center of earth

Between poles and equator

When the length of a microscope tube increases its magnifying power

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Decreases

Increases

Does not change

May increase or decrease depending on the observer and the place of observation

The blending of light when it passes from one medium to another is known as:

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Refraction

Interfarance

Polarization

Both (B) and (C)

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