Which of the following is not a consequence of a force field?
- A. wieght
- B. surface tension
- C. gravitational pull
- D. magnetic force
- E. electric force
Which of the following is NOT a vector quantity?
- A. momentum
- B. force
- C. velocity
- D. temperature
- E. displacement
Two radioactive elements A and B have half-lives of 100 and 50 years respectively. Samples of A and B initially contain equal amounts/number of atoms. What is the ratio of the number of the remaining atoms of A to that of B after 200 years?
- A. 4 : 1
- B. 2 : 1
- C. 1 : 1
- D. 1 : 2
- E. 1 : 4
Which of the following is not an electromagnetic radiation?
- A. X-ray
- B. Radio waves
- C. Sunlight
- D. Sound waves
- E. Infra-red radiation
An electron of charge 1.6 x 1019C is accelerated in vacuum from rest at zero volt towards a plate of 40KV. Calculate the kinetic energy of the electron.
- A. 4 x 10 25J
- B. 4 x 1021 J
- C. 6.4 x 1020 J
- D. 6.4 x 10-15 J
- E. 2.5 x 1020 J
Which of the following is/are not affected by a magnetic field?
I. Neutrons
II. Cathode rays
III. Alpha particles
- A. I only
- B. II only
- C. III only
- D. I & III only
- E. I, II & III
Which of the following is/are not correct about isotopes of an element? The have
- A. the same neutron number
- B. the same proton number
- C. same number of electrons
- D. same chemical properties
- E. different physical poperties.
The unit of inductance is the
- A. farad
- B. henry
- C. hertz
- D. ampere
- E. coulomb
Which of the following explains the concave meniscus of water in a glass tube?
- A. The adhesion between water and glas is greater than the cohesion between water molecules
- B. The cohesion between water molecule is greater than the adhesion between glass and water
- C. The molecules of water in the glass are moving faster than the molecules in the other parts
- D. The molecules of water at the water-air boundary are often attracted to the center of the tube
- E. The weight of the water pulls the central part of the surface down
When sugar at the bottom of a glass of water gradually dissolves, the water level does not change applicably. Which of the following statements best describe this?
- A. Water is suitable solvent for sugar
- B. The sugar and the water have become single solution
- C. The volume of water molecule does not change when sugar dissolves.
- D. Sugar molecule is small than that of water
- E. Water molecules are separated by large spaces between them
Which of the following particles of ray has the highest penetrating power?
- A. Beta particles
- B. Alpha particles
- C. Gamma particles
- D. Electrons
- E. Neutrons
Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
- A. 0.0000267Ωcm
- B. 0.006Ωcm
- C. 0.26700Ωcm
- D. 0.27500Ωcm
- E. 0.060000Ωcm
Which of the following statement is not correct about loaded spiral spring?
- A. The extension is proportional to the load applied, provided the elastic limite is not exceeded
- B. If the elsatic limit is not exceeded, the contraction is proportional to the load removed.
- C. Up to the yield limit, extension is no longer proportional to the applied load.
- D. Beyond the elsatic limit, extension is no longer proportional to the applied load.
- E. If the string regains its shape or form after deformation, it is said to be elastic.
What is the effect of using split-rings in a simple d.c motor?
- A. The direction of rotation of the coil is reversed
- B. The current in the coil flows in the same direction
- C. The current in the coil becomes alternating
- D. The direction of the force on the coil is reversed
- E. The contact with the voltage is cut-off
A lamp is marked 220V 60 W. Calculate the energy it would consume when connected to a 220V source for 1 hour.
- A. 216000J
- B. 13200J
- C. 3600J
- D. 864J
- E. 220J
It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).
- A. 64 minutes
- B. 32 minutes
- C. 8 minutes
- D. 2 minutes
- E. 1 minute
Two parallel conductors carry equal currents in the same direction. Which of the following statement is not a correct observation?
- A. Each of teh conductors will experience a force
- B. Each of the conductors can move
- C. The forces on the conductors will be equal
- D. There are concentric lines of force around each conductor
- E. The two conductors will repel each other
A battery of emf 24V and internal resistance 4Ω is connected to a resistor of 32Ω. What is the terminal p.d of the battery?
- A. 24.0V
- B. 21.3V
- C. 16.0V
- D. 2.7V
- E. 2.0V
A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively. Calculate the internal resistance of the cell.
- A. 0.2Ω
- B. 0.4Ω
- C. 1.0Ω
- D. 3.0Ω
- E. 9.0Ω
Local action is normally prevented from taking place in a simple electric cell by
- A. introducing an oxidising agent into the acid
- B. not drawing current continuously for long periods
- C. amalgamating the surface of the zinc plate
- D. using a porous pot to isolate the zinc plate from the acid
- E. using dilute sulphuric acid
A transformer with 5500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary
- A. 11000
- B. 2750
- C. 460
- D. 232
- E. 10