MCQ

MCQ 11 Mark

Which of the following measurement is most accurate?

✓
$3000\ g$
B
$3.0\ kg$
C
$3.00\ kg$
D
$3 \ kg$

Answer

Correct option: A.

$3000\ g$

$3000g$ is the most accurate measurement because it has a maximum number of significant figures $= 4.$

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MCQ 21 Mark

Moon has no atmosphere and acceleration due to gravity at its surface is one-sixth that at the earth's surface. When a pendulum is taken from earth to moon surface, its time period will:

✓
Increase
B
decrease
C
Not change
D
becomes infinite.

Answer

Correct option: A.

Increase

When a pendulum is taken from earth to moon surface, its time period will increase because the acceleration due to gravity on the moon is less than that on earth and the time period depends inversely on the square root of acceleration due to gravity.

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MCQ 31 Mark

A person sitting on a swing stands up. The time period of swing:

A
Increases
✓
decreases
C
Does not change
D
become zero

Answer

Correct option: B.

decreases

The time period of swing decreases because, in the standing position, the center of the mass of the person shifts upwards. Due to which the effective length of the pendulum, $I$ decreases. As $T \propto \sqrt{l_r}$ therefore time decreases.

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MCQ 41 Mark

Which of the following is not a unit of distance?

✓
Leap year
B
parsec
C
light year
D
Angstrom

Answer

Correct option: A.

Leap year

Leap year because it is a unit of time.

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PHYSICS MCQ

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