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Checkpoint 3 Physics

Total questions: 32

Worksheet time: 26mins

Name
Class
Date
1.

How do you convert kg/m3 to g/cm3?

a)

multiply by 1000

b)

divide by 1000

c)

multiply by 100

d)

divide by 100

2.

Steel has a density of 7900 kg/m3, mercury 13500kg/m3. What happens if a steel ball was placed on mercury?

a)

The ball sinks

b)

The ball floats

c)

The ball accelerates forward

3.

Steel has a density of 7900 kg/m3 & Aluminium has 2700 kg/m3. Which is heavier 1m3 of Steel or 1m3 of Aluminium?

a)

Steel

b)

Aluminium

c)

Both are same

4.

The mass of a block was 88.4 g. The original volume of water in the measuring cylinder was 50 cm3, the combined volume of block and water was 84 cm3. What is the density of the block?

a)

1.76 g/cm3

b)

2.60 g/cm3

c)

3.45 g/cm3

d)

4.42 g/cm3

5.

Most people can float on water, what does this say about the density of human body?

a)

human body is less dense than water

b)

water is less dense than human body

6.

What is 1 N/m2 also called as?

(a)  

7.

Which exerts more pressure A or B?

a)

A

b)

B

c)

Both

8.

Drivers in iceland let their tyres soft while driving on snow. Why?

a)

to increase pressure for better grip

b)

to lower the pressure so they dont sink

9.

Which of the following is NOT a use of increasing pressure?

a)

Studs

b)

Pins & Spikes

c)

Knives

d)

Skies

10.

Calculate the force exerted on the bigger piston.

a)

0.1 N

b)

10 N

c)

100 N

d)

1000 N

11.

Why do water bottles crush when returning from a hill station to plains?

a)

the pressure outside the bottle is more at plains

b)

the pressure inside the bottle is less at plains

c)

the pressure outside the bottle is more on hills

12.

A fulcrum is also called?

(a)  

13.

Which class of lever is a crowbar? (Hint: FLE)

a)

First Class

b)

Second Class

c)

Third Class

14.

Where will the strongest force be exerted by scissor blades to cut through a piece of paper?

a)

at the pivot of the scissors

b)

at the edges of the blades

c)

at the handles

15.

Calculate the Force F

a)

40 N

b)

15 N

c)

20 N

d)

30 N

16.
When a balloon is rubbed on clothes it acquires a charge by ___________
a)
Induction
b)
reduction
c)
friction 
d)
concuction
17.
When a plastic rod is rubbed with wool, why does the wool acquire a positive charge?
a)
Protons are transferred from the rod to the wool.
b)
Protons are transferred from the wool to the rod.
c)
Electrons are transferred from the rod to the wool.
d)
Electrons are transferred from the wool to the rod.
18.
Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?
a)
The balloons will repel each other.
b)
The balloons will attract each other.
c)
The balloons will become positively (+) charged.
d)
The balloons will pop.
19.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
20.
Which of the following is caused by static electricity?
a)
a stove getting hot when it is turned on
b)
a magnet being attracted to a refrigerator
c)
a lightning strike during a storm
d)
a light bulb coming on when a switch is turned on
21.
What is static electricity caused by?
a)
A balance of power
b)
A balance of positive and negative charges
c)
. An imbalance of positive and negative charges
d)
An imbalance of protons and neutrons
22.
What are waves that can transfer heat through the vacuum of empty space?
a)
Electromagnetic waves
b)
Convection
c)
Conduction
d)
Heat
23.
What is the transfer of heat by direct contact?
a)
conduction
b)
convection
c)
radiation
24.
You buy a lava lamp from the store. As the lamp heats up, blobs of liquid rise to the top then sink back down to the bottom. This process continues because of _?_.
a)
conduction
b)
convection
c)
radiation
25.

Which heat transfer is being shown in box #2?

a)

conduction

b)

radiation

c)

convection

d)

freezing

26.
What is the definition of CONVECTION
a)
When heat transfers through the heater or AC in your house.
b)
When heat transfers from objects that are touching.
c)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
d)
 hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
27.
What is the definition of RADIATION
a)
 hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
b)
When heat is transferred from objects like rays of light or electromagnetically.
c)
When heat transfers from objects that are touching.
d)
When heat transfers through the heater or AC in your house.
28.
In heat transfer, heat always flows from the _______________ substance to the _______________ substance.
a)
Hotter to colder
b)
Colder to hotter
c)
Hotter to hotter
d)
Colder to colder
29.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
30.
This is the symbol for a ...
a)
Bulb
b)
Battery
c)
Horn
d)
Fuse
31.

What is the name of this component?

a)

PN junction

b)

LED

c)

silicon

d)

PNP

32.
Diode 
a)
 allows current to flow in one direction
b)
 allows current to flow in two directions
c)
is a resistor

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