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1009 available questions

Physics · Question 461

Minimum enery required for pair production is :

  1. 939 MeV
  2. 942 MeV
  3. 1.02 MeV
  4. 0.511 MeV
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Correct answer: C

1.02 MeV

Physics · Question 462

When a neutron enters into a magnetic field B perpendicularly with velocity v, its acceleration is:

  1. Zero
  2. Centripetal
  3. Positive
  4. Uniform and non-zero
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Correct answer: A

Zero

Physics · Question 463

Which of the following is the rapid process:

  1. conduction
  2. radiation
  3. convection
  4. all of these
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Correct answer: B

radiation

Physics · Question 464

Ohm's Law is applicable only when temperatur remains

  1. Changing
  2. Absolute zero
  3. Constant
  4. None of these
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Correct answer: C

Constant

Physics · Question 465

Two electric bulbs “A” and “B" of powers S00W and 2000W respectively are connected to 240V supply. The ratio of current passing through bulb "A" to the current passing through bulb “B” is:

  1. 0.0430555555555556
  2. 0.0444444444444444
  3. 0.0472222222222222
  4. 0.0527777777777778
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Correct answer: B

0.0444444444444444

Physics · Question 466

Electricity consumption is calculated commercially in:

  1. Kilo-watt
  2. Kilo-watt hour
  3. Mega watt
  4. Giga watt
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Correct answer: B

Kilo-watt hour

Physics · Question 467

Two charges one of which is Qy = 3yC and second one is C = -lyC are separated by 100cm. The electric potential is zero at a point

  1. 25cm from Q2
  2. 75cm from Q2
  3. 50cm from Q1
  4. 33.30m from Q1
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Correct answer: A

25cm from Q2

Physics · Question 468

A force which acts on an object moving in a circle and is directed towads the center of the circle is called

  1. Bending Force
  2. Cenripetal Force
  3. Centrifugal force
  4. None of these
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Correct answer: B

Cenripetal Force

Physics · Question 469

A fixed mass of an ideal gas is contained in a cylinder at constant temperature. Now the pressure of the gas is decreased. What happened to the molecules of gas?

  1. their mean square speed decreases
  2. Number of collision between molecules and walls of container decreased
  3. The force of attraction between them increase
  4. Their size decreases
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Correct answer: B

Number of collision between molecules and walls of container decreased

Physics · Question 470

The half life of radioactive element is

  1. 0.693λ
  2. 0.693/λ
  3. λ/0.693
  4. 1/λ
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Correct answer: C

λ/0.693