Practice Physics Jamb Past Questions

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Jamb Past Questions

Duration: 30 minutes

1. The net charge of an atom is zero because
A. electrons and the protons are charged in the nucleus
B. The total charge in the elcxtrons is equal to the total charge in the neutrons
C. The neutrons form a shield around the charged protons
D. The number of electrons in an atom is equal to the number of protons
2. It is known that a neutron exists in a light atomic nucleus. Which of the following exists in the nucleus
A. An electron
B. β - particle
C. α - particle
D. A proton
3. Which of the following statements are true in the structure of atoms:
A. Atoms of different elements differ only in the number of protons and electrons
B. The number of protons equal the number of electrons
C. Atoms are constructed according to the plan of our solar system
D. All of the above
4. Which of the following phenomena cannot be explained by the molecular theory of matter
A. Expansion
B. Conduction
C. Convection
D. Radiation
5. The product PV where P is pressure and V is volume has the same unit as
A. Force
B. Power
C. Energy
D. Acceleration
6. The absolute temperature of a perfect gas is proportional to the average
A. Potential energy of the molecules
B. Separation between the molecules
C. Kinetic energy of the molecules
D. Velocoity of the molecules
7. The heat from the sun reaches the earth by the process of
A. Insulation
B. Precipitation
C. Conduction
D. Radiation
8. By which of these methods does heat travel by vacuum only?
A. Conduction
B. Convection
C. Radiation
D. Al three methods
9. If an object is placed in front of two mirrors inclined at 90°. How many images will be formed
A. 5
B. 4
C. 3
D. 2
10. When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
A. Diminished and upright
B. Diminished and inverted
C. Enlarged and inverted
D. Enlarged and upright
11. A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object
A. 12
B. 24
C. 48
D. 108
12. An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed
A. 30cm and virtual
B. 6cm and real
C. 6cm and virtual
D. 30cm and real
13. Which of the following gives the linear magnification produced by a concave mirror of radius of curvature r, if u and v are object and image distances respectively
A. v/r
B. 2v/r - 1
C. u/r - 1
D. 2u/r - 1
14. A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will
A. Increase as r reduces
B. increase as G varies
C. remain constant
D. incrases as r increases
15. The thermometric property of thermocouple is that:
A. e.m.f changes with temperature
B. volume changes with temperature
C. Resistance changes with temperature
D. pressure changes with resistance
16. Water is a poor thermometric liquid because it
A. has low vapour density
B. is opaque
C. is a poor conductor
D. wets glass
17. A clinical thermometer is different from a mercury in mass thermometer owing to
A. it's long stem
B. the constriction of it's stem
C. it's wide range of temperatures
D. The grade of mercury used in it
18. One advantage of alcohol over mercury as a thermometric liquid is
A. low freezing poing
B. low boiling point
C. high specific heat capacity
D. low density
19. Clinical thermometers are examples of
A. pressure-gas thermometer
B. resistance thermometer
C. alcohol thermometer
D. mercury-in-glass thermometer
20. When the volume of a given mass of gas is halved and it's temperature doubled, the pressure
A. remains constant
B. increases by a factor of 4
C. increases by a factor of 3
D. deacreases by a factor of 4
21. The amount of heat required to raise the temperature of a body is
A. Thermal energy
B. thermal conduction
C. heat loss
D. thermal capacity
22. Hot water is added to three times it's mass of water at 100°C and the resulting temperature is 20°C. What is the initial temperature of the hot water.
A. 100°C
B. 80°C
C. 50°C
D. 40°C
23. The amount of heat needed to raise the temperature of 10kg of copper by 1k is it's
A. Specific heat capacity
B. heat capacity
C. Latent heat
D. Internal heat
24. A block of aluminium is heated electrically by a 25W heater. If the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminium is
A. 850JK-1
B. 750JK-1
C. 600JK-1
D. 500JK-1
25. The water at the bottom of a waterfall is slightly warmer than that at the top because part of the
A. potential energy raises the water temperature
B. water absorbs latent heat from the atmosphere
C. Kinetic energy is changed into internal enery
D. dropping mass of water increases the heat capacity

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