Science

Physics

Some Natural Phenomena, Friction & Sound

All The Best

Section A

Multiple Choice & Checkbox

Multiple Choice

Lightning ⚡ occurs when two charges meet they are:-

• Positive

• Negative

• Both a & b

• None

Multiple Choice

Which of the following is responsible for causing an Earthquake🌎:-

• The inner core of the earth 🌎

• The mantle of the earth 🌎

• The crust of the earth 🌎

• The outer core of the earth 🌎

Multiple Choice

Amber is a kind of --------

• Gum

• Resin

• Both (a) & (b)

• None of these

Multiple Select

Four children were asked to order forces due to rolling, static, and sliding frictions in decreasing order. Their arrangements are given below. Choose the correct arrangement.

• rolling, static, sliding

• rolling, sliding, static

• static, sliding, rolling

• sliding, static, rolling

Multiple Select

Friction can be reduced by using

• Oil

• Grease

• Powder

• Soil

Multiple Choice

Hertz is equal to

• 1 vibration per minute

• 10 vibrations per minute

• 60 vibrations per minute

• 600 vibrations per minute

Multiple Choice

Sound is produced by: -

• Non-Vibrating objects only

• Vibrating and non- vibrating objects

• Vibration has no relation to sound

• Vibrating objects only

Multiple Choice

The number of oscillations per second is called: -

• Amplitude of oscillation

• Pitch of oscillation

• Frequency of oscillation

• All of the Above

Multiple Choice

Name the American scientist, who showed that lightning and the spark from your clothes are essentially the same phenomena

• Charles Babbage

• Jeff Bezos

• Alexander Fleming

• Benjamin Franklin

• Albert Einstein

Section B

Fill In the Blank or Open Ended

Open Ended

All objects moving in fluids have ___________ shape to reduce ___________.

Open Ended

Sounds which are unpleasant to the ear is called __________.

Open Ended

Vibration is a repeated __________ and __________ motion.

Section C

True or False

Multiple Choice

The process of transfer of charges from a charged object to the earth is called lightning.

• True

• False

Multiple Choice

A lightning rod is a device used to secure tall buildings from the effect of lightning.

• True

• False

Multiple Choice

The tremors produce waves on the surface of the earth.

• True

• False

Multiple Choice

Fluids are only liquids.

• True

• False

Multiple Choice

A soapy floor is slippery due to increased friction.

• True

• False

Multiple Choice

Friction can be reduced by using lubricants.

• True

• False

Multiple Choice

Friction can be reduced by using ball bearings in some machines.

• True

• False

Multiple Choice

All human beings can hear sounds of frequencies up to 60,000 Hz.

• True

• False

Multiple Choice

The sound in a sitar is produced by plucking its strings.

• True

• False

Multiple Choice

The loudness is expressed in a unit called a decibel

• True

• False

Multiple Choice

Light travels much faster than sound.

• True

• False