PLMGS Prelim P1(Q21-Q40)

Quiz by Jessica Lew

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Q 1/20
Score 0
An immersion heater rated at 150 W is fitted into a large block of ice at 0°C. The specific latent heat of fusion of the ice is 300 J/g. How long does it take to melt 10 g of the ice?
29
150 s
20 s
2.0 s
5.0 s

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20 questions

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Q1
An immersion heater rated at 150 W is fitted into a large block of ice at 0°C. The specific latent heat of fusion of the ice is 300 J/g. How long does it take to melt 10 g of the ice?
150 s
20 s
2.0 s
5.0 s
120s
Q2
Air is blown into ether through the glass tube shown. After some time, it is observed that the film of water freezes into ice. Which of the following best describes the processes that result from the blown air?
rate of evaporation of ether(decreases);average energy of remaining molecules(increases)
rate of evaporation of ether(decreases);average energy of remaining molecules(decreases)
rate of evaporation of ether(increases);average energy of remaining molecules(decreases)
120s
Q3
The ratio of the masses of two metal blocks X and Y is 2:1. They are both heated uniformly using identical heaters. The temperature-time graphs of the blocks are shown below.(assume that there is no heat loss to the surroundings) What is the ratio of the specific heat capacities of X and Y respectively?
1 : 2
1 : 4
2 : 1
4 :1
120s
Q4
Which of the following diagrams correctly shows the arrangement of a lamp, lens and film in a photograph enlarger?
120s
Q5
A ray of light is passing through a piece of diamond out into the air. Given that the speed of light in vacuum is 3.0 x 10⁸ m/s , what is the speed of light in diamond?
7.3 x 10⁸ m/s
2.5 x 10⁸ m/s
1.2 x 10⁸ m/s
3.6 x 10⁸ m/s
120s
Q6
An observer looks through a tiny hole drilled at the 40 cm mark of a metre long ruler. What are the minimum and maximum readings that the observer can read?
min(30 cm);Max( 60 cm)
min(20 cm);Max( 80 cm)
min(0 cm);Max( 100 cm)
min(20 cm);Max( 70 cm)
120s
Q7
The diagram below shows a ruler clamped at the end of a bench, with a length of the ruler projecting to position Y. The end of the ruler was pushed down to Z and then released. The ruler vibrated for a while between Z and X, emitting a sound wave of frequency 50 Hz. How long did it take for the end of the ruler to move from Z to X?
0.020 s
25 s
50 s
0.010 s
120s
Q8
How do the wavelength, frequency and speed of infrared radiation in vacuum compare with those of gamma radiation?
wavelength(shorter) frequency(higher) speed(same)
wavelength(longer) frequency(higher) speed(slower)
wavelength(longer) frequency(lower) speed(same)
wavelength(same) frequency(lower) speed(slower)
120s
Q9
A sound wave passes through air. The diagram below represents the arrangement of air molecules at one instant. Which distance is the wavelength of the sound wave?
A
C
D
B
120s
Q10
A loudspeaker S is placed 100 m away from a long, large wall. The loudspeaker produces a single loud beep sound. A microphone T is placed 200 m away from the loudspeaker and receives 1 sound directly from S and the other sound due to the reflection from the wall. What is the time interval between the two sounds received by the microphone T, given that the speed of sound in air is 330 m/s?
0.30 s
0.61 s
0.25 s
0.072 s
120s
Q11
The diagram below shows a water wave in a ripple tank. The wave has a speed of 7.5 cm/s at R. The wave crosses a boundary PQ where the distance between crest changes. What is the speed of the wave at S?
4.0 cm/s
1.7 cm/s
3.8 cm/s
1.9 cm/s
120s
Q12
The diagram below shows a negative point charge near two negatively charged objects. In which direction will the negative point charge move?
A
B
C
D
120s
Q13
The figure below shows a positively charged metal sphere placed between two uncharged metal spheres, one of which is grounded to the earth. Which of the diagrams correctly shows how the charges are distributed on the spheres?
120s
Q14
The diagram shows some white Styrofoam beads inside a transparent plastic casing. The casing is shaken and the beads rub against the casing. The beads remain attracted to the inside surface of the casing. Which is a possible explanation for the observation?
beads(gains electrons); casing(loses electrons)
beads(loses electrons); casing(no change of electrons)
beads(gains electrons); casing(gains protons)
beads(loses protons); casing(no change of protons)
120s
Q15
In the circuit shown, R1 and R2 are identical resistors. Which of the following changes to the electrical components X and Y will decrease the reading of the ammeter the most?
Immerse X in a beaker of ice water and increase the light intensity on Y
Immerse X in a beaker of hot water and decrease the light intensity on Y
Immerse X in a beaker of ice water and decrease the light intensity on Y
Immerse X in a beaker of hot water and increase the light intensity on Y
120s