Science

Question 1

How do engineers minimize drag in vehicle design?

Answer 1

b. By using streamlined shapes

Question 2

How does friction contribute to heat production?

Answer 2

By transferring kinetic energy

Question 3

What effect does friction have on a moving object?

Answer 3

Slows it down

Question 4

What determines the amount of friction between two surfaces?

Answer 4

The roughness of the surfaces

Question 5

What effect does air resistance have on falling objects like feathers or parachutes?

Answer 5

Slows down their fall

Question 6

Which force is responsible for making it harder to go faster when riding a bike or running?

Answer 6

Air resistance

Question 7

How does the size of an object affect air resistance?

Answer 7

Larger objects face more air resistance.

Question 8

What does air resistance depend on?

Answer 8

The object’s shape and size

Question 9

In which direction does friction act?

Answer 9

Opposite to the object’s motion

Question 10

What is friction?

Answer 10

A force between two surfaces in motion or attempting motion

Question 11

How does friction affect speed?

Answer 11

more friction decreases speed

Question 12

Which statement about air resistance is correct?

Answer 12

Air resistance opposes the motion of objects through the air.

Question 13

What is drag?

Answer 13

type of friction

Question 14

Which is the energy caused by the vibration of particles in a medium?

Answer 14

sound energy

Question 15

What type of energy do we get from the food we eat?

Answer 15

chemical

Question 16

Which of the following are examples of potential energy?

Answer 16

nuclear energy

Question 17

Which of the following is a force acting on an object due to gravity?

Answer 17

Weight

Question 18

Which of the following units is a measure of weight?

Answer 18

Newton (N))

Question 19

Which of the following units is a measure of mass?

Answer 19

Kilogram (kg)

Question 20

What is the fundamental difference between mass and weight?

Answer 20

Mass is a measure of the amount of matter in an object, while weight is the force of gravity acting on that mass.

Question 21

How does mass change with location in the universe?

Answer 21

Mass remains constant regardless of location.

Question 22

THRESHING IS USED TO SEPERATE

Answer 22

GRAINS FROM STALKS

Question 23

The sugar cubes are called the

Answer 23

solute

Question 24

There are two types of mixture

Answer 24

Heterogeneous and homogeneous

Question 25

This method is a technique used in separating a less-dense substance from a denser one.

Answer 25

decantation

Question 26

Melting of ice is a _______________ change.

Answer 26

Reversible change

Question 27

The substance being dissolved is called the _____________.

Answer 27

solute

Question 28

What is a solvent?

Answer 28

The substance that does the dissolving in a solution.

Question 29

Which method can you use to separate sand and iron filings?

Answer 29

Magnetism

Question 30

Which one is having larger grain size?

Answer 30

sugar lump

Question 31

Stirring causes the particles of the solute to spread out into the spaces between the particles of the solvent ____________________.

Answer 31

faster

Question 32

The generally solutes dissolve _________ in cold water.

Answer 32

slower

Question 33

Melting of butter is a _______________ change

Answer 33

Reversible change

Question 34

The water is called the

Answer 34

solvent

Question 35

This involves using a strainer or a big screen to separate the components of solid mixtures.

Answer 35

sieving

Question 36

FIND THE METHOD OF SEPERATION. (PICKING UNWANTED STONES FROM RICE)

Answer 36

HAND-PICKING

Question 37

A dilute solution would be ..................

Answer 37

have small amount of solute

Question 38

What's the best to define a homogeneous mixtures?

Answer 38

We can not distinguish their components at first sight

Question 39

What method of separation would work best to separate water and salt?

Answer 39

evaporation

Question 40

A solution is made when one substance _________ in another.

Answer 40

dissolves

Question 41

The Earth's atmosphere is a ____________________ mixture.

Answer 41

Homogeneous

Question 42

What method of separation would work best to separate water and rubber pellets?

Answer 42

filtration

Question 43

A dilute solution would be ..................

Answer 43

have small amount of solute

Question 44

Is a solution a HOMOGENEOUS mixture or a HETEROGENEOUS mixture?

Answer 44

Homogeneous mixture

Question 45

Is a mixture where you can see the separate parts HOMOGENEOUS or HETEROGENEOUS'

Answer 45

Heterogeneous

Question 46

Heating makes solid dissolves faster because heat speeds up the particles and allows to spread through the solution more easily.

Answer 46

True

Question 47

Which one is a separation method?

Answer 47

Distillation, evaporation and filtration.