## Physics 2018 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

21. The pitch of an acoustic device can be increased by

• A. decreasing the loudness
• B. increasing the intensity
• C. increasing the frequency
• D. decreasing the intensity

22. One of the features of the fission process is that

• A. it leads to chain reaction
• B. its products are not radioactive
• C. neutrons are not released
• D. the of the masses of the reactants equals the sum of the masses of the products

23. The linear expansivity of brass is 2 x 10$$^{-5}$$ C$$^{-1}$$. If the volume of a piece of brass is 15.00cm at 0°C, what is the volume at 100°C

• A. 16.03cm$$^3$$
• B. 15.09cm$$^3$$
• C. 16.00cm$$^3$$
• D. 15.03cm$$^3$$

24. A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is

• A. 100J
• A. 150J
• C. 50J
• D. 200J

25. In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

• A. 30V
• B. 70V
• C. 50V
• D. 40V

26. If the fraction of the atoms of a radioactive material left after 120years is  $\frac{1/}{64}$, what is the half-life of the material?   $\frac{1/}{64}$

• A. 20 years
• B. 10 years
• C. 2 years
• D. 24 years

27.

In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?

• A. U
• B. T
• C. R and T
• D. Q and R

28. The time rate of loss of heat by a body is proportional to the

• A. temperature of its surroundings
• B. temperature of the body
• C. difference in temperature between the body and its surroundings
• D. ratio of the temperature of the body to that of its surroundings

29. A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

• A. no charge and a zero potential
• B. a positive charge and a zero potential
• C. a negative charge and a positive potential
• D. a negative charge and a negative potential

30. Electrical appliances in homes are normally earthed so that

• A. a person touching the appliances is safe from electric shock
• B. both the a.c. and d.c. sources can be used
• C. the appliances are maintained at a higher pd than the earth
• D. the appliances are maintained at a lower pd than the earth

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