Physics Practice Question and Answer

Q:

What is the correct order of radiations in descending order of frequencies?

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  • 1
    Infrared > Microwaves > Radio waves > X-rays
    Correct
    Wrong
  • 2
    Radio waves > X-rays > Microwaves > Infrared
    Correct
    Wrong
  • 3
    X-rays > Infrared > Microwaves > Radio waves
    Correct
    Wrong
  • 4
    Infrared > Microwaves > X-rays > Radio waves
    Correct
    Wrong
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Answer : 3. "X-rays > Infrared > Microwaves > Radio waves"
Explanation :

The correct order of radiations is in descending order of frequencies.

 X-rays > Infrared > Microwaves > Radio waves

Q:

What is the degree of dissociation for strong electrolytes?

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  • 1
    1
    Correct
    Wrong
  • 2
    0
    Correct
    Wrong
  • 3
    Less than 1
    Correct
    Wrong
  • 4
    Greater than 1
    Correct
    Wrong
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Answer : 1. "1"
Explanation :

Strong electrolytes have a degree of dissociation close to one, while weak electrolytes have a degree of dissociation less than one. Solvent nature: Solvents with a high dielectric constant show more dissociation. Dilution: As the solution is diluted, the degree of dissociation increases.

Q:

Which of the following is correct about uniform acceleration?

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  • 1
    An object moving on friction-less surface can gain uniform acceleration.
    Correct
    Wrong
  • 2
    An object under free fall is an example of uniform acceleration.
    Correct
    Wrong
  • 3
    An object moving with constant speed is an example of uniform acceleration.
    Correct
    Wrong
  • 4
    Motion of a spring is an example of uniform acceleration.
    Correct
    Wrong
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Answer : 2. "An object under free fall is an example of uniform acceleration."
Explanation :

1. The change in velocity of an object at equal time intervals is called uniform acceleration.

2. A freely falling object is an example of uniform acceleration.

Q:

Consider copper and aluminum wire whose length and resistance are the same. Also, the specific resistance of aluminum is more than copper. Select the correct statement

473 0

  • 1
    Copper and aluminum mass are the same
    Correct
    Wrong
  • 2
    Copper wire has more mass than the aluminum wire
    Correct
    Wrong
  • 3
    Copper wire has less mass than the aluminum wire
    Correct
    Wrong
  • 4
    The information given is incomplete
    Correct
    Wrong
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Answer : 4. "The information given is incomplete "

Q:

What does an electric dipole experience when it is kept in the non-uniform electric field?

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  • 1
    Only a force
    Correct
    Wrong
  • 2
    Only torque
    Correct
    Wrong
  • 3
    Force and torque both
    Correct
    Wrong
  • 4
    Neither force nor torque
    Correct
    Wrong
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Answer : 3. "Force and torque both"
Explanation :

An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.


Q:

The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______. 

467 0

  • 1
    48 J
    Correct
    Wrong
  • 2
    12 J
    Correct
    Wrong
  • 3
    36 J
    Correct
    Wrong
  • 4
    24 J
    Correct
    Wrong
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Answer : 4. "24 J"

Q:

Which of the following elements has the largest atomic radii?

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  • 1
    Beryllium
    Correct
    Wrong
  • 2
    Lithium
    Correct
    Wrong
  • 3
    Nitrogen
    Correct
    Wrong
  • 4
    Carbon
    Correct
    Wrong
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Answer : 2. "Lithium"
Explanation :

Francium (Fr) has the highest atomic radius in the periodic table. It belongs to the alkali metals group. Its atomic number is 87. The periodic trend of atomic radius suggests that the atomic radius usually decreases along a period (left to right) and increases down a group (top to bottom).

Q:

Degree of dissociation does not depend on which of the following factors?

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  • 1
    Nature of the solute
    Correct
    Wrong
  • 2
    Nature of the solvent
    Correct
    Wrong
  • 3
    Sound
    Correct
    Wrong
  • 4
    Concentration
    Correct
    Wrong
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Answer : 3. "Sound "
Explanation :

The Degree of dissociation does not depend on catalyst.The equivalent conductivity of 0.1M weak acid is 100 times less than that at infinite dilution.

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