Question # 1

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

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2.0 x 10^-5/°C

4.0x10^-5/°C

6.0x10^-5/°C

2.33x10^-5/°C

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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6 ohm

4 ohm

zero ohm

1.33 ohm

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

Albert A. Michelson devised interferometer is

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1820

1845

1860

1881

A ball is thrown upwards with a velocity of 100 m/s.It will reach the ground after

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10 s

20 s

5 s

40 s

Huygen's principle states that:

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Light travels in straight line

Light has dual nature

Either of these

None of these

1 kg mass of a substance is equivalent to the mass of

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1.1 x 10³⁰ electrons

11 x 10¹⁹ electrons

1.6 x 10³¹ electrons

9.1 x 10¹⁹ electrons

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron hole is generated

all of them

The cause of power loss in optic fibre is

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Absorption

Scattering

Dispersion

All

Angular velocity is a

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Scalar quantity

Vector quantity

Constant quantity

None of these

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

A collision is said to be elastic during this collision

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K.E of the system remains conserved

momentum of the system remains conserved

total energy of the system remains conserved

all of them

The product of force and time of impact force is called

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Momentum

Impulsive force

Impulse

Rate of change of momentum

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