Properties Of Matter Test

Result

Properties Of Matter Test - 2

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Question 1
1 / -0

Which of the following is the most elastic?

A
Rubber

B
Glass

C
Steel

D
Plastic

Solution

Steel is the most elastic as the greater the Young's modulus, greater the elasticity.
Question 2
1 / -0

A bowler swings a cricket ball due to

A
Boyle's law

B
Magnus effect

C
Viscosity

D
Surface tension

Solution

A bowler swings a cricket ball due to Magnus effect. The Magnus effect is a commonly observed effect in which a ball (or cylinder) curves away from its principal flight path. It is important in many ball sports. It affects missiles and has some engineering uses, for instance, in the designing of rotor ships and flettner airplanes.
Question 3
1 / -0

A square wire frame of size L is dipped in a liquid. On taking it out, a membrane is formed. If the surface tension of the liquid is T, then the force acting on the frame will be

A
2 TL

B
4 TL

C
8 TL

D
10 TL

Solution

Membrane has two free surfaces.
The surface tension of a liquid is defined as the force per unit length in the plane of the liquid surface, acting at right angles on either side of an imaginary line drawn on that surface.

Thus, T = F/L

Since, membrane has two free surfaces, total force acting is given by
F = 2 × T × boundary of frame
F = 2T × 4L
F = 8 TL
Question 4
1 / -0

If a liquid does not wet a glass, then its angle of contact is

A
zero

B
acute

C
obtuse

D
right angle

Solution

For the liquids, which do not wet a glass, the liquid meniscus is convex upward, so angle of contact is obtuse.