Question # 1

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

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adiabatically

isothermally

isochorically

isobarically

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5Ω

1.1Ω

5.0Ω

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

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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4/5Ω

5/4Ω

20Ω

0.05 Ω

Gamma rays consist of steam of

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electron

proton

photons

all of these

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

The curve representing an adiabatic process is called

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isotherm

adiabat

adiable

none of them

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

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5

0.5

0.005

50

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

When a falling body hits ground, its KE changes to _____ energy.

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Potential

Chemical

Mechanical

sound and heat

0.1 kg mass will be equivalent to the energy

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9 x 10¹⁵J

5 x 10⁸J

6 x 10¹⁶J

9 x 10^-16J

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 104 gausses

1 Wb-m²= 1 tesla

All of the above

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

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