Question # 1

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

The amplifier which us used to perform mathematical operations electronically is known as

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calculator

OP-AMP

computer

any one of them

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

The collision in which KE is conserved but momentum is not conserved is called:

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Elastic collision

Inelastic collision

any these

None of these

The quantity have dimension of ML²T⁰²will have SI unit of:

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Watt

Newton

Joule

Metre

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

A disc rolls down a hill and its speed at bottom is found to be 11.4 m/sec. Height of the hill is then nearly:

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10 m

12 m

13 m

15 m

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

During each cycle, alternating voltage reaches a peak value

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One time

Two times

Four times

A number of times depending on the frequency

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

The inkjet printer ejects a thin stream of:

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Water

Oil

Ink

Any of above

None of these

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5μF

10μF

3μF

6μF

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

Magnetic induction is also called as:

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Ampere’s law

Faraday’s law

Lenz’s law

Newton’s law

Coulomb’s law

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

The waves which propagate out in the space due to oscillations of electric and magnetic fields are called:

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Mechanical waves

Electromagnetic waves

Matter waves

All of them

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

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