The critical angle for light traveling from a transparent medium to air s measured as 34ΒΊ. The refractive index of the medium is
- A. 0.56
- B. 1.50
- C. 1.79
- D. 2.02
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 340ms\(^-1\), how far is he from the hill?
- A. 66m
- B. 136m
- C. 264m
- D. 528m
A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid
- A. 0.33
- B. 0.50
- C. 1.50
- D. 3.00
A resistor connected to a 12V battery draws a current of 2A. The energy dispatched in the resistor in 5 minutes is ___.
- A. 3,600J
- B. 6,000J
- C. 7,200J
- D. 14,400J
When a known standard resistor of 2.0 is connected to the 0.0cm end of a metre bridge, the balance point is found to be at 55.0cm
- A. 1.10Ξ©
- B. 1.64Ξ©
- C. 2.44Ξ©
- D. 27.50Ξ©
The photo cell works on the principle of the
- A. Voltaic cell
- B. Emission of electron by incident radiation
- C. Emission of protons by incident radiation
- D. Photographic plate
A lens of focal length 15cm forms an erect image which is three times the size of the object. The distance between the object and the image is ___.
- A. 10cm
- B. 20cm
- C. 30cm
- D. 40cm
The image of an object is located 6cm behind a convex mirror. If it’s magnification is 0.6, calculate the focal length of the mirror
- A. 3.75cm
- B. 6.70cm
- C. 10.00cm
- D. -15.00cm
If the focal length of a camera is 20cm, the distance from the film at which the lens must be set to produce a sharp image of 100cm away is
- A. 17cm
- B. 20cm
- C. 25cm
- D. 100cm
Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to
- A. Heat dissipation
- B. Production of eddy currents
- C. Excessive current discharge
- D. Excessive voltage discharge
Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?
- A. Pair of calipers
- B. Meter rule
- C. Micrometer screw gauge
- D. Tape rule
An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is
- A. 25.2N
- B. 17.4N
- C. 12.6N
- D. 9.0N
The efficiency of energy conversion on the energy flow through a hydroelectric power is?
- A. \(\frac{E1}{E2}\)
- B. \(\frac{E3}{E2}\)
- C. \(\frac{E2}{E1}\)+ E2
- D. \(\frac{E2}{E3}\) + E1
A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms\(^{-1}\). Determine the magnitude of the resulting impulse
- A. 20.0kgms\(^{-1}\)
- B. 10.0kgms\(^{-1}\)
- C. 5.0kgms\(^{-1}\)
- D. 2.5kgms\(^{-1}\)
Palm oil from a bottle flows out more easily after it has been heated because the
- A. Molecules do not increase speed during the heating
- B. Viscosity of oil is reduced
- C. Oil molecules force each other out
- D. Adhesion between the oil molecules and those of the bottle is increased
Which of the following is the dimension of pressure
- A. ML\(^{β1}\)T\(^{β2}\)
- B. MLT\(^{β2}\)
- C. ML\(^{2}\)T\(^{3}\)
- D. ML\(^{β3}\)
To keep a vehicle moving at a constant speed V requires power P from the engine. The force provided by the engine is
- A. \(\frac{P}{v}\)
- B. (\(\frac{1}{2}\))V
- C. PV
- D. \(\frac{P}{V^2}\)
A particle of mass M initially at rest splits into two. If one of the particles of mass M1 moves with velocity V1 , the second particle moves with velocity
- A. \(\frac{M1V1}{M-M1}\)
- B. \(\frac{M1V1}{M1-M}\)
- C. \(\frac{M1V1}{M}\)
- D. \(\frac{MV}{M-M1}\)
The friction which exist between two layers of liquid in relative motion is called.
- A. Capillary
- B. Surface
- C. Viscosity
- D. Cohesion
Which of the following phenomena cannot be explained by the molecular theory of matter?
- A. Conduction
- B. Convection
- C. Expansion
- D. Radiation
A room is heated by means of a charcoal fire, an occupants of the room standing away from the fire is warmed mainly by
- A. Convection
- B. Radiation
- C. Conduction
- D. Reflection