Physics | Study Mode

Question 1

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is

Bqv

Bq\(\frac{v}{m}\)

Bqvm

mv\(\frac{B}{q}\)

\(\frac{mv}{Bq}\)

Explanation

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Correct option: C

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Question 2

The helium isotope \(^3_2He\)

has three pro tons and two neutrons

has two protons and one neutron

has two protons and three neutrons

has one proton and two neutrons

cannot exist because it has the same mass number as tritium

Explanation

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Correct option: E

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Question 3

When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as

photoelectric effect

thermionic emission

field emission

secondary emission

radioactive emission

Explanation

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Correct option: B

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Question 4

A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?

50N

40N

30N

20N

10N

Explanation

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Correct option: C

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Question 5

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant.

2.890 s^-1

1 .445 s^-1

0.576 s^-1

0.347s^-1

0.152 s^-1

Explanation

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Correct option: D

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Question 6

Which of the following is used in a nuclear reactor to slow down fast moving neutrons?

graphite rods

carbon dioxide gas

liquid sodium metal

concrete shield

boron rods

Explanation

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Correct option: A

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Question 7

When electrical power is transmitted over long distances, the voltage is stepped up so that

the resistance of the wire may be increased proportionately to the potential difference

the time of transmissions between the generating and the receiving stations may be reduced

there is increased current to produce brighter lights.

the rate of electrical consumption is increased.

the energy waste may be minimised as the current is lowered.

Explanation

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Correct option: E

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Question 8

A gas occupies a certain volume at 27C. At what temperature will its pressure remains constant?

54C

108C

150C

327C

600C

Explanation

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Correct option: A

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Question 9

What is the coefficient of static friction between a load of mass 2kg and a horizontal surface, if the limiting frictional force is 10N? (g = 10 ms^-2)

0.2

0.5

Explanation

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Correct option: B

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Question 10

When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is

anti-clockwise

clockwise

equal to the product to the forces

numerically equal to the total forces acting

equal to zero

Explanation

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Correct option: B

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Physics | Study Mode

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