Deyi Secondary 2021 Prelims
Quiz by Jessica Lew
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- Q1
Which of the following correctly describe(s) an action-reaction pair?
I Both forces act at the same time.
II Both forces act on the same body.
III Both forces act in different directions.
IV Both forces have the same magnitude.
I only
I, II, III and IV
II and III only
I, III and IV only
120s - Q2
Two objects X and Y are identical in size and shapebut X has 3 times the mass of Y.
They are both released simultaneously from a point 100 m above the ground.
Which of the following statement(s) is/ are true?
I At the moment of release, the rate of change of velocity is the same for X and Y.
II Both and Y will reach the same terminal velocity.
III X will reach the floor before Y.
I, II and III
I and III only
II and III only
I only
120s - Q3
A standing fan can topple if tilted. The centre of gravity of the fan is marked G and the angle of tilt is marked θ. Which of the following statements is true?
The fan will topple at a larger angle θ if the area of the base is decreased.
The fan will topple at a smaller angle θ if weights are added to its base.
The fan will topple at a larger angle θ if the stem of the fan is extended
longer.
The fan will topple at a smaller angle θ if the stem of the fan is extended
longer.
120s - Q4
The resistance of a resistance thermometer is 3.21Ω at 10 °C and 4.20 Ω at 100 °C.
What is the temperature at which the resistance is 3.76 Ω?
40 °C
50 °C
56 °C
60 °C
120s - Q5
Which of the following is/are true when a substance undergoes a change of state from liquid to gas?
I Internal energy is increased.
II Kinetic energy is increased.
III Work is done to break the intermolecular bonds between its particles
I only
I and II only
I and III only
II only
120s - Q6
The bulb of a thermometer is wrapped in a tube of cotton fabric. The fabric is dipped into water at room temperature and left for some time. The thermometer wrapped in wet fabric is then removed and evaporation takes place.
What happens to the thermometer reading?
It rises
It remains unchanged
It falls.
It rises and then falls
120s - Q7
Infra-red waves, microwaves, radio waves and sound waves are used for communication.
Which waves travel at the same speed in a vacuum?
infra-red waves, radio waves and sound waves
infra-red waves, microwaves and sound waves
microwaves, radio waves and sound waves
infra-red waves, microwaves and radio waves
120s - Q8
The diagram shows a beam of electrons entering a magnetic field. What is the effect of the magnetic field on the electrons?
They are deflected towards the top of the paper
They are deflected towards the bottom of the paper
They are deflected into the plane of the paper
They are deflected out of the plane of the paper.
120s - Q9
The diagram below shows a circuit with a rectangular coil. It has two iron rods in it. The rods are parallel, in contact with each other and are free to move around. What happens when the switch is closed?
The iron rods roll to and fro together in the coil.
The iron rods move away and stay apart from each other
The iron rods move apart for a while before attracting each other again
No changes can be observed
120s - Q10
The diagram below shows two cylindrical wires X and Y. Their lengths and cross-sectional diameters are as shown. Both wires are made from copper. If the resistance of wire X is R Ω, what is the resistance of wire Y ?
4 R
8 R
1/8 R
1/4 R
120s
