Sign In

Physics for IGCSE & O level - The Earth In Space (Section 6)

1
Which of the following is essential for performing calculations?
Answer
(B)
A calculator
2
What is the primary function of radio telescopes in studying the Big Bang theory?
Answer
(B)
Detecting cosmic microwave background radiation (CMBR).
3
What does 'direct proportion' mean in the context of a graph?
Answer
(B)
As one variable increases, the other increases.
4
What type of electromagnetic radiation is mentioned as evidence of the Big Bang?
Answer
(C)
Cosmic microwave background radiation
5
What measuring instrument is a color?
Answer
(A)
Ruler
6
What should be written on readings?
Answer
(B)
Correct Units
7
What is the key phrase given?
Answer
(C)
Core and Extended Level
8
What is the best method of measuring the thickness of a single sheet of paper?
Answer
(C)
Measuring the stack of papers.
9
What is a possible cause for electric shock in experiments?
Answer
A
D
10
If the current is too high, what may occur?
Answer
(C)
Fuses or wires may overheat
11
State two conditions needed for an object to be in equilibrium.
Answer
A
C
12
What is the 'Doppler Effect' mostly related to in astronomy?
Answer
(B)
The study of the movement of the galaxies
13
A car of mass 1000kg accelerates at 1 m/s² along a straight, flat road. What is the resultant force acting on the car?
Answer
(C)
1000 N
14
What did scientists in the past think about the universe?
Answer
(B)
The universe was not expanding.
15
What is the purpose of reading scales?
Answer
(A)
To measure
16
What are some important aspects of a scientific experiment?
Answer
(D)
All of the above
17
What did Hubble discover that supported the Big Bang theory?
Answer
(B)
The expansion of the universe.
18
When experimenting, which is considered the independent variable?
Answer
(B)
The length of wire
19
Which are essential elements of a well-presented graph?
Answer
A
B
C
20
Which of the following is a unit of length?
Answer
(C)
Meter
21
Why is the length of a pendulum important when calculating the period?
Answer
(B)
As the length increases, the period increases.
22
Which concept is essential for understanding the expansion of the universe?
Answer
(B)
The Doppler effect
23
What instrument measures electrical current?
Answer
(C)
Ammeter
24
What does the text mention as a type of evidence for the Big Bang theory?
Answer
(C)
Cosmic microwave background radiation
25
What type of lens is used to correct short-sightedness?
Answer
(A)
Concave
26
What is the relationship between heat and temperature?
Answer
(B)
Heat represents the total energy of all molecules
27
How can you improve the accuracy of your measurements?
Answer
A
C
28
What is an important factor in measuring the temperature of a liquid?
Answer
(B)
Keep the thermometer in the liquid while taking the reading
29
What is important when working with radioactive sources?
Answer
(D)
All of the above
30
Which of the following is required for the measurements?
Answer
A
B
C
31
What are some of the key ideas covered in the 'History of key ideas' section?
Answer
A
B
C
D
32
Which idea is associated with the expansion of the universe?
Answer
(A)
Redshift
33
What is a critical safety measure regarding glassware?
Answer
(A)
Never put hot glass in cold water.
34
Which motor has the highest efficiency?
Answer
(B)
motor B
35
Why are you required to tie your hair up when using the burner?
Answer
(B)
To protect from heat and possible fire hazards.
36
Which statement best explains why copper is a better thermal conductor than glass?
Answer
(D)
In copper, there are free electrons that transfer the thermal energy.
37
Which of the following are common hazards to avoid in the lab?
Answer
(D)
All of the above
38
What could be considered a 'practical preparation' for a test?
Answer
(A)
Going through the checklist
39
What variable can change from one situation to another?
Answer
(D)
A variable
40
When heating with a burner, what are important safety measures to consider?
Answer
A
B
41
What are the two primary safety features associated with a Bunsen burner?
Answer
B
C
42
What did Count Rumford observe during cannon boring?
Answer
(A)
Heat generated by friction
43
What information should be included in a scientific report?
Answer
A
B
C
D
44
Who used the model of the atom with the nucleus like the sun and the electron orbiting like the planets?
Answer
(C)
Rutherford
45
What is the relationship between the distance of a galaxy and its redshift?
Answer
(C)
The greater the distance, the greater the redshift.
46
What is the dependent variable in the experiment about the length of a wire and its resistance?
Answer
(D)
Resistance of the wire
47
If y doubles, then x does what?
Answer
(A)
Doubles
48
What happens to the space between galaxies as the universe expands?
Answer
(C)
It expands
49
What is the meaning of the word 'reciprocal'?
Answer
(C)
One divided by the number
50
Which components are used in an electric circuit?
Answer
(B)
resistor