MCQ

MCQ 11 Mark

In convection currents,

A
hot molecules rise up
B
cold molecules sink down
C
molecules actually move from their place
✓
all of these

Answer

Correct option: D.

all of these

MCQ 21 Mark

The state of matter, in which the kinetic energy of the molecules is so small that they cannot overcome the intermolecular force of attraction between them, is $–$

✓
solid
B
liquid
C
gas
D
plasma

Answer

Correct option: A.

solid

View full question & answer→

MCQ 31 Mark

How does the kinetic energy of a molecule in a substance change with a decrease in its temperature?

A
It remains the same
B
It increases
✓
It decreases
D
It becomes twice

Answer

Correct option: C.

It decreases

View full question & answer→

MCQ 41 Mark

The temperature at which a solid changes into its liquid state is called

A
boiling point
B
freezing point
C
condensation point
✓
melting point

Answer

Correct option: D.

melting point

View full question & answer→

MCQ 51 Mark

The force of attraction between two similar types of molecules is called

A
adhesion.
✓
cohesion,
C
electrostatic force
D
conduction.

Answer

Correct option: B.

cohesion,

View full question & answer→

MCQ 61 Mark

Molecules of a solid

✓
vibrate at their positions.
B
move only when heated.
C
move because they are loosely bound.
D
do not move at all.

Answer

Correct option: A.

vibrate at their positions.

View full question & answer→

PHYSICS MCQ

Test yourself on this topic