PLMGS 2021 Prelim Paper 1(Q1-20)
Quiz by Jessica Lew
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- Q 1/20Score 0
The diameter of a steel ball is measured using a micrometer screw gauge. A student takes an initial zero error reading and then a reading of the diameter as shown. What is the actual diameter of the steel ball?
294.79 mm
4.35 mm
4.88 mm
4.82 mm
- Q1
The diameter of a steel ball is measured using a micrometer screw gauge. A student takes an initial zero error reading and then a reading of the diameter as shown. What is the actual diameter of the steel ball?
4.79 mm
4.35 mm
4.88 mm
4.82 mm
120s - Q2
A ticker tape timer is operated at a frequency of 50 Hz. The diagram shows the dot pattern on the tape when it is pulled to the left by a toy car. What is the velocity of the toy car through the segment AB of the tape?
200 cm/s
186 cm/s
260 cm/s
236 cm/s
120s - Q3
A boy shoots an arrow vertically upwards. Given that the arrow takes 5.0 s to reach the highest point, what is the distance travelled by the arrow when the time is 2.0 s?
80 m
20 m
100 m
30 m
120s - Q4
A ball falls from rest through air and eventually reaches a constant velocity. For this fall, forces X and Y vary with time as shown. What are forces X and Y?
upthrust(X); Resultant Force(Y)
air resistance(X); Weight(Y)
air resistance(X); Resultant Force(Y)
upthrust(X); Weight(Y)
120s - Q5
An object falls freely from rest without air resistance from the top of the building. It falls through a total distance of x metres in 2.0 seconds and falls through a total distance of y metres in 4.0 seconds. What is the ratio of x : y?
2 : 3
1 : 4
1 : 3
1 : 2
120s - Q6
In a tennis match, Serena hits the ball of mass 60 g towards Naomi with a speed of 40 m/s. Naomi hits the ball back to Serena along the same path in the opposite direction with a speed of 40 m/s. Given that the contact time with the racket is 5.0 ms, what is the force exerted by Naomi in returning the ball?
400 N
480 N
0 N
960 N
120s - Q7
A lift moves upward at a constant deceleration of 2.0 m/s2. Given that the lift has a mass of 500 kg, what is the tension in the cable that support the lift?
4000 N
5000 N
6000 N
2400 N
120s - Q8
The three forces acting on a hot air balloon that is moving vertically are its weight, the force due to air resistance and the upthrust force. The upthrust force acting on the hot air balloon is a constant value. When the hot air balloon descends vertically at constant speed, the force of air resistance on the balloon is F. How much weight must be released from the balloon so that it ascends vertically at the same constant speed? [Note: air resistance acting on an object is directly related to the speed of the object]
4F
F
2F
3F
120s - Q9
When solid X of mass 15.0 g is immersed in a measuring cylinder filled with water, it displaces the same volume of water as solid Y of mass 3.0 g. What can be deduced about the densities of solids X and Y?
Both X and Y have the same densities
Density of X is five times the density of Y.
Density of X one-fifth of the density of Y.
Density of X is half the density of Y.
120s - Q10
A 10.0 kg block of iron is brought from Earth to the surface of a planet. Given that the gravitational field strength of that planet is 3.90 N/kg, how will the properties of the iron block change?
The weight of the iron block will increase.
The density of the iron block will increase.
The gravitational force on the iron block will decrease.
The mass of the iron block will decrease.
120s - Q11
The diagram shows a hammer in 3 different positions X, Y and Z. Which of the following matches the figures with their respective types of equilibrium?
neutral(Y);stable(X);unstable(Z)
neutral(Z);stable(X);unstable(Y)
neutral(Z);stable(Y);unstable(X)
neutral(X);stable(Y);unstable(Z)
120s - Q12
A box of 6 kg mass is being pulled up a ramp of length 6.0 m by a force F from rest as shown. Given that the friction along the surface is 4.0 N and the final speed of the box on top of the ramp is 2.0m/s, what is the force F required to bring the box to the top of the ramp?
46 N
42 N
64 N
4.0 N
120s - Q13
The diagram shows a muscle and bones in a person’s arm. The hand holds a load of weight 40 N. The elbow acts as a pivot and the tension in the muscle keeps the lower part of the arm horizontal. What is the tension in the muscle due to the load
280 N
1400 N
47 N
240 N
120s - Q14
A diagram shows a balancing toy pivoted on a stand. If the toy is tilted slightly, it returns back to its original position. Where is the centre of mass of the toy?
Inside the aeroplane nearest to the pivo
Inside the weight
Between the aeroplanes
Below the pivot
120s - Q15
The motor in the diagram has a power input of 500 W. It is used to lift a load weighing 600 N through a vertical height of 10 m in 20 s. What is the power efficiency of the motor?
90%
30%
40%
60%
120s
