# JAMB Physics Past Questions

## Which of the following statements on the use of X-rays is incorrect? X-rays are used

JAMB 1980 Which of the following statements on the use of X-rays is incorrect? X-rays are used A. in hospitals to obtain photogaphs of tissues and bones in the body B. for the treatment of malignant growths like cancer cells C. in detecting fingerprints D. to reveal hidden flaws in metal castings and welded joints …

## In a compound microscope

JAMB 1980 In a compound microscope A. there is only one lens B. the objective lens have a shorter focal length than the eyepiece which is convex C. the objective lens has a longer focal length than the eyepiece which is convex D. the objective lens has a shorter focal length than the eyepiece which …

## If the volume of a fixed mass of a gas is kept constant, the pressure of the gas…

JAMB 1980 If the volume of a fixed mass of a gas is kept constant, the pressure of the gas A. is inversely proportional to its centigrade temperature B. is inversely proportional to its absolute temperature C. is directly proportional to its centigrade temperature D. is directly proportional to its absolute temperature E. remains constant …

## A quantity of sungas at -133 occupies 1/3m³ under pressure 1.4 x 10^5 Nm^-2. if the gas occupies 31 m³ at 37°C, its pressure will be

JAMB 1980 A quantity of sungas at -133 occupies 1/3m³ under pressure 1.4 x 10^5 Nm^-2. if the gas occupies 31 m³ at 37°C, its pressure will be A. 1.26 x 10³Nm^-2 B. 3.3 x10³Nm^-2 C. 1.35 x 10³Nm^-2 D. 2.2 x 10³Nm^-2 E. 10^5Nm^-2 Correct Answer: Option B Explanation P1V1/T1 = P2V2/T2 Since the …

## A milliameter of resistance 5Ω and full scale deflection of 5mA is to used to measure a potential difference of 50V…

JAMB 1980 A milliameter of resistance 5Ω and full scale deflection of 5mA is to used to measure a potential difference of 50 V. The resistance of the multiplier should be A. 95Ω B. 110Ω C. 595Ω D. 995Ω E. 1005Ω Correct Answer: Option D Explanation V = IR 50 = 50 x 10^-3 (5 …

## A pressure cooker saves both time and fuel in cooking because inside the cooker, the

JAMB 1980 A pressure cooker saves both time and fuel in cooking because inside the cooker, the A. boiling point of water is raised B. pressure is constant C. heat is completely trapped D. temperature is evenly distributed E. volume of steam varies Correct Answer: Option A Explanation When atmospheric pressure increases, the boiling point …

## In the diagram above, MN is perpendicular to ON and MR what is the difference between the…

JAMB 1980 In the diagram above, MN is perpendicular to ON and MR what is the difference between the moment about N of the force of 20 Newtons applied along MP an its moment about O. A. Zero B. 0.2N.m C. 0.4N.m D. 0.8N.m E. 0.6N.m Correct Answer: Option A Explanation There is absolutely no …

## Natural radioactivity consists of the emission of

JAMB 1980 Natural radioactivity consists of the emission of A. α -particle and β rays B. α -particle and X-rays C. γ-rays and X-rays D. α-particle, β rays and γ-rays E. α -particle, β rays, γ-rays and X-rays Correct Answer: Option D Explain your answer in the comment box below and let’s have a discussion …

## Which of the following physical quantities is NOT a vector

JAMB 1980 Which of the following physical quantities is NOT a vector? A. velocity B. work C. force D. electric field intensity E. magnetic induction Correct Answer: Option B Explain your answer in the comment box below and let’s have a discussion so as to have a great understanding of this question! PREVIOUS     …

## The activity of a radioactive substance depends on

JAMB 1980 The activity of a radioactive substance depends on A. temperature and purity B. temperature and age C. purity and age D. age, purity and temperature E. none of the above Correct Answer: Option C Explanation Physical factors like temperature and pressure does not have direct influence on radioactivity, this is because radioactivity involves …