From the diagram above, calculate the energy stored in the capacitor
- A. 4.0 x 10\(^{-2}\)J
- B. 4.0 x 10\(^{-4}\)J
- C. 8.0 x 10\(^{-4}\)J
- D. 8.0 x 10\(^{-2}\)J
How can energy loss be minimized through Eddy-current?
- A. By using high resistance wire
- B. By using insulated soft iron wires
- C. By using low resistance wires
- D. Bu using turns of wires
A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms\(^{-2}\)]
- A. 0.04m
- B. 0.12m
- C. 0.01m
- D. 0.08m
Determine the focal length of a thin converging lens if the power is 5.0 dioptres
- A. 0.1 m
- B. 0.2 m
- C. 2.0 m
- D. 2.5 m
Which of the following is a scalar quantity?
- A. Tension
- B. Weight
- C. Impulse
- D. Mass
A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 ร 108ms\(^{โ1}\). Calculate the wavelength of the radio wave
- A. 2.20 ร 10\(^3\)m
- B. 5.0 ร 10\(^2\)m
- C. 5.0 ร 10\(^5\)m
- D. 11.8 ร 10\(^{11}\)m
A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms\(^{-2}\) the power expended is
- A. 100w
- B. 200w
- C. 400w
- D. 500w
The instrument used to measure the pressure of a gas is
- A. barometer
- B. thermometer
- C. hydrometer
- D. manometer
The net capacitance in the circuit above is
- A. 80ยตF
- B. 6.0ยตF
- C. 4.0ยตF
- D. 2.0ยตF
Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo
- A. number of turns in the coil is increased
- B. strength of the field magnet is increased
- C. slip rings are replaced with split ring commutator
- D. coil is wound on a soft iron armature
When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
- A. 240v
- B. 340v
- C. 480v
- D. 57600v
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is
- A. 1:4
- B. 4:1
- C. 1:1
- D. 2:1
Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high
- A. 10 cm
- B. 16 cm
- C. 5 cm
- D. 14 cm
The S.I unit of moment of a force is
- A. kgm
- B. Nm
- C. Jm
- D. ยตm\(^{-1}\)
An element and its isotope only differ in the number of
- A. protons
- B. electrons
- C. ions
- D. neutrons
Which of the following instruments helps to maintain the correct humidity and temperature of a building?
- A. A compressor
- B. A refrigerator
- C. Air blower
- D. Air conditioner
Three 3ฯ resistance are connected in parallel what is the equivalent resistance?
- A. 1ฯ
- B. 9ฯ
- C. 3ฯ
- D. 0.33ฯ
A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine
- A. 80.0%
- B. 76.6%
- C. 66.7%
- D. 60.7%
Which of the following statements is NOT correct?
- A. Molecules of a liquid are stationary
- B. Brownian motion is an evidence of particle nature of matter
- C. Matter is made up of molecules
- D. The molecules of matter are in constant motion
A cell of internal resistance 2ฮฉ supplies current to a 6ฮฉ resistor. The efficiency of the cell is
- A. 12.0%
- B. 25.0%
- C. 33.3%
- D. 75.0%
Calculate the specific latent heat of vaporization of steam of 1.13 x 106J of heat energy is required to convert 15kg of steam to water.
- A. 7.53 x 105 Jkg\(^{-1}\)
- B. 7.53 x 10-2Jkg\(^{-1}\)
- C. \(7.53 \times 10^{4}\)Jkg\(^{-1}\)
- D. 7.53 x 10-3Jkg\(^{-1}\)