2012 - JAMB Physics Past Questions and Answers - page 2
11
An object of volume 1 m 3 and mass 2kg is totally immersed in a liquid of density 1 kgm-3 . Calculate its apparent weight.
A
20N
B
10N
C
2N
D
1 N
12
The pressure at any point in a liquid at rest depends only on the
A
depth and the density
B
mass and the volume
C
quantity and the surface area
D
surface area and the viscosity
correct option: a
Users' Answers & Comments13
A balloon whose volume is 300m3 is filled with hydrogen. If the density of air is 1.3 kgm-3, find the upthrust on the balloon. [g = 10ms-2]
A
3000N
B
3800N
C
3900N
D
4200N
14
Clinical thermometers are examples of
A
pressure gas thermometer
B
resistance thermometer
C
alcohol thermometer
D
mercury- in - glass thermometer
correct option: d
Users' Answers & Comments15
Two metals P and Q are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of their
length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is
length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is
A
1:2
B
2:1
C
8:9
D
9:8
correct option: a
P: \(\frac{\alpha h \theta}{\alpha h \theta}\)
\(\frac{2 \times 3 \times \theta}{3 \times 4 \times \theta}\)
\(\frac{1}{2}\)
Users' Answers & Comments\(\frac{2 \times 3 \times \theta}{3 \times 4 \times \theta}\)
\(\frac{1}{2}\)
16
2000cm3 of a gas is collected at 27oC and 700mmHg. What is the volume of the gas at standard temperature and pressure?
A
1896.5cm3
B
1767.3cm3
C
1676.3cm3
D
1456.5cm3
correct option: c
\(V_2 = \frac{P_1V_1T_2}{P_2T_2}\)
\(V_2 = \frac{700 \times 2000 \times 273}{760 \times 300}\)
Users' Answers & Comments\(V_2 = \frac{700 \times 2000 \times 273}{760 \times 300}\)
17
Calculate the temperature change when 500J of heat is supplied to 100g of water
A
12.1oC
B
2.1oC
C
1.2oC
D
0.1oC
correct option: c
\(\theta = \frac{Q}{MC}\)
\(\theta = \frac{500}{0.1 \times 4200}\)
Users' Answers & Comments\(\theta = \frac{500}{0.1 \times 4200}\)
18
Which of the following is NOT a factor that can increase the rate of evaporation of water in a lake?
A
increase in the pressure of the atmosphere
B
rise in temperature
C
increase in the average speed of the molecules of water
D
increase in the kinetic energy of the molecules of water
correct option: a
Users' Answers & Comments19
The quantity of heat energy required to melt completely 1 kg of ice at - 30oC is
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1x10 3Jkg -1K -1]
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1x10 3Jkg -1K -1]
A
4.13x10 6J
B
4.13x10 5J
C
3.56x10 4J
D
3.56x10 2J
20
I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?
A
I,II and III only
B
II,III and IV only
C
I,III and lV only
D
l, ll and lV only
correct option: d
Users' Answers & Comments