Which of the following substances is not an insulator?
- A. Aluminium
- B. Glass
- C. Plastic
- D. Clay
- E. Cork
Beta particles are
- A. electrons
- B. protons
- C. neutrons
- D. helium nuclei
- E. tritium nuclei
A transformer with 5500 turns in its primary winding is used between a 240V a.c supply and 120V kettle. Calculate the number of turns in the secondary winding
- A. 11000
- B. 2750
- C. 460
- D. 550
- E. 232
Which of the following is a stringed instrument?
- A. Flute
- B. Trumpet
- C. Piano
- D. Drum
- E. Organ
A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
- A. 1k
- B. 2k
- C. 5k
- D. 10k
- E. 20k
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field of strength B in the direction of the field. The force on the particle is
- A. qvB
- B. mqvB
- C. qvB/m
- D. mvB/q
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
- A. 180Ω
- B. 27Ω
- C. 3Ω
- D. 1.3Ω
- E. 0.8Ω
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
- A. a moving coil ammeter
- B. a D.C generator
- C. a D.C electric motor
- D. An induction coil
- E. An A.C generator
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
- A. 8.75V
- B. 7.50V
- C. 5V
- D. 2.50V
- E. 1.25V
Which of the following scientists postulated that moving particles exhibit wave properties?
- A. Niels Bohr
- B. Ernest Rutherford
- C. Werner Heisenberg
- D. Louis de Broglie
- E. Erwin Schroedinger
Which of the following is not a part of an A.C generator?
- A. Carbon brushes
- B. Slip rings
- C. Commutator
- D. Field magnet
- E. Armature
The electrical energy supplied by a Leclanche cell is obtained from the
- A. Nuclear energy
- B. Magnetic energy
- C. Solar energy
- D. Chemical energy
- E. Mechanical energy
Which of the following has the shortest wavelength?
- A. Infrared rays
- B. Gamma rays
- C. Ultra violet rays
- D. Radio waves
- E. Visible light
Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun?
- A. II only
- B. I only
- C. II and III only
- D. I and II only
The inability of the eye to focus near objects is known as
- A. Long sight
- B. Astigmatism
- C. Presbyopia
- D. Glaucoma
- E. Short sight
A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
- A. 2cm
- B. 4cm
- C. 15cm
- D. 25cm
- E. 100cm
The image of an object placed at the center of the curvature of a concave mirror is
- A. Inverted and magnified
- B. at the principal focus
- C. real and diminshed
- D. Erect and virtual
- E. at the center of the curvature
A hygrometer is an instrument used to measure
- A. Dew point
- B. Temperature
- C. Relative density
- D. Relative humidity
- E. Vapour pressure
A steam trap is a component of apparatus used in determining the specific latent heat of vaporization of steam. In the steady state, the steam trap
- A. stores the steam for future use
- B. prevents the steam from escaping
- C. ensures that only dry steam gets into the calorimeter
- D. allows condensed steam to go into the calorimeter
- E. determines the quantity of steam used
A tap supplies water at 30°C while another supplies at 86°C. If a man wishes to bath with water at 44°C, calculate the ratio of mass of hot water to that of cold water required
- A. 1:3
- B. 3:1
- C. 3:7
- D. 7:3
- E. 15:8
The instrument used in the measurement of atmospheric pressure is?
- A. Hydrometer
- B. Ratemeter
- C. Barometer
- D. Photometer
- E. Manometer