Jamb 1999 Physics Past Questions And Answers
A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?
- A. 2mA
- B. 10mA
- C. 20mA
- D. 25mA
In flemings right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the
- A. motion, the field and the induced current
- B. induced current, the motion and the field
- C. field, the induced current and the motion
- D. induced current, the field and the motion
2311Na + Proton →pqX + alpha particle What are the values of p and q respectively in the equation above?
- A. 10 and 20
- B. 12 and 24
- C. 20 and 10
- D. 24 and 12
A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is
- A. 1 . 25 x 104 W
- B. 2 . 50 x 104 W
- C. 1 . 25 x 106 W
- D. 2 . 50 x 106 W
Gamma rays are produced when
- A. high velocity electrons are abruptly stopped in metals
- B. energy changes occur within the nucleus of atoms
- C. energy changes occur within the electronic structure of atoms
- D. electrons are deflected in very strong magnetic fields
Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.
- A. 1 : 4
- B. 2 : 1
- C. 2 : 3
- D. 2 : 5
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. 40V
- C. 50V
- D. 70V
Steel is more suitable for permanent magnet than iron because the former
- A. is easily demagnetized by shaing vigorously
- B. is an alloy of many metals
- C. is easily magnetized by alternating current through one cycle
- D. retains magnetism more than iron
I. A liquid boils when its saturated vapour pressure is equal to the external pressure II. Dissolved substances in pure water lead to increase in the boiling point. III. When the external pressure is increased, the boiling point increases. IV. Dissolved substances in pure water decrease the boiling point. Which combination of the above are peculiarities of the boiling point of a liquid?
- A. I, II and III
- B. I, II, III and IV
- C. I, II and IV
- D. II, III and IV
What is the speed of a particle of mass 10-27kg whose wavelength is 10-8m. [h = 6.63 x 10-34Js]
- A. 6.63m/s
- B. 66.30m/s
- C. 663.00m/s
- D. 6630.00m/s