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1009 available questions

Physics · Question 471

An ideal AC generator has equal input and output, its heat dissipation will be:

  1. Of some finite value
  2. Zero
  3. Maximum
  4. Very much small
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Correct answer: B

Zero

Physics · Question 472

What is the fraction of atom left after 10 half-life of a substance?

  1. 1/512
  2. 1/1024
  3. 1/256
  4. 1/2048
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Correct answer: B

1/1024

Physics · Question 473

Force acting on a positive charge is always_______________

  1. in the direction opposite to electric field
  2. in the direction of electirc field
  3. in the direction prependicular to electic field
  4. in the direction prependicular to the velocity of charge
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Correct answer: C

in the direction prependicular to electic field

Physics · Question 474

Which of the following is equivalent to a temperature 350K?

  1. 77 C
  2. -77 C
  3. 623 C
  4. -623 C
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Correct answer: A

77 C

Physics · Question 475

During adiabatic expansion internal energy decreases by 2J , then work done in this process is

  1. 2J
  2. 1J
  3. -1J
  4. -2J
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Correct answer: A

2J

Physics · Question 476

In a conducting electric wire, the electric A. Radioactivity current flows due to

  1. Protons
  2. lons
  3. Holes
  4. Electrons
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Correct answer: D

Electrons

Physics · Question 477

Iodine-131 is used to trace which cancer:

  1. lungs
  2. thyroid gland
  3. breast
  4. liver
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Correct answer: B

thyroid gland

Physics · Question 478

A projectile is thrown at an angle of 45° with horizontal and its range is Ry. Another projectile is thrown at an angle of 45° with vertical and its range is R;. The relation between Ry and Ry is:

  1. R2 = 2R1
  2. R1 = 2R2
  3. R1 = R2
  4. 3R = R2
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Correct answer: C

R1 = R2

Physics · Question 479

If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be:

  1. L, 2A
  2. L/2, 2A
  3. 2L, 2A
  4. 2L , A/2
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Correct answer: B

L/2, 2A

Physics · Question 480

When a standing wave is set up on a string fized at both ends, which of the following statements is true?

  1. Sum of the number of antiondes and the number of nodes is always even
  2. Wavelength = length string / number of nodes
  3. The shape of the string at any instant shows a symmetry about the midpoint of the string
  4. Frequency = number of nodes X fundamental frequency
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Correct answer: C

The shape of the string at any instant shows a symmetry about the midpoint of the string