Jamb 2014 Physics Past Questions And Answers
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
- A. 1C
- B. 5C
- C. 4C
- D. 2C
When21082Pb decays to20680Pb, it emits
- A. two alpha and two beta particles
- B. an alpha particle
- C. one beta particle
- D. one alpha and one beta particle
The maximum power transfer occur in a cell when the external resistance is
- A. Twice the internal resistance of the cell
- B. The same as the internal resistance of the cell
- C. Greater than the internal resistance of the cell
- D. Less than the internal resistance of the cell
When an atom undergoes a beta decay, the atomic number of the nucleus
- A. Remains unchanged
- B. Decreases by one
- C. Increases by one
- D. Becomes zero
Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x106m
- A. 25.3kms-1
- B. 4.2kms-1
- C. 4.0kms-1
- D. 11.3kms-1
A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when
- A. A 300Ω resistor is connected to it in parallel
- B. An 80Ω resistor is conneceted to it in series
- C. A 150Ω resistor is connected to it in parallel
- D. A 240Ω resistor is connected to it in series
A quantity which requires magnitude and direction to be specified is
- A. Temperature
- B. Distance
- C. Displacement
- D. Mass
What is the best method of demagnetizing a steel bar magnet?
- A. Hammering
- B. Heating it
- C. Rough handling it
- D. Solenoid method
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
- A. 2.5x102
- B. 2.5x10-2
- C. 2.5x10-1
- D. 2.5x101
A glass bottle of initial volume 2 x 104cm3 is heated from 20oC to 50oC. If the linear expansivity of glass is 9 x 10-6K-1, the volume of the bottle at 50oC is
- A. 20016.2cm^3
- B. 20005.4cm^3
- C. 20008.1cm^3
- D. 20013.5cm^3