The angle between the direction of the earth’s magnetic field and the horizontal is called the
- A. angle of deviation
- B. magnetic declination
- C. magnetic meridian
- D. angle of dip
Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
- A. Gamma rays, ultraviolet rays, X- rays, infra - red rays
- B. Gamma rays, X-rays, ultraviolet rays, infra-red rays
- C. infra-red rays, ultraviolet rays, X-rays, gamma rays
- D. Gamma rays, ultraviolet rays, infra-red rays, X-rays
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
- A. 30o
- B. 42o
- C. 45o
- D. 50o
The speed of light in air is 3 x 108ms-1. What is the speed in glass with a refractive index of 1.50?
- A. 1.5 x 108ms-1
- B. 3.0 x 108ms-1
- C. 2.0 x 108ms-1
- D. 6.0 x 108ms-1
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
- A. He cannot see distant objects clearly
- B. Rays of light from a close object are focused in front of his retina
- C. His eye ball is too long
- D. Parallel rays of light are focused behind his retina
A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
- A. 12cm
- B. 24cm
- C. 48cm
- D. 108cm
When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
- A. diminished and upright
- B. diminished and inverted
- C. enlarged and inverted
- D. enlarged and upright
Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.
- A. i, ii, and iv
- B. i, ii, iii
- C. ii and iii
- D. i and iii
What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?
- A. 80Hz
- B. 600Hz
- C. 800Hz
- D. 1600Hz
A note is the octave of another note if it has
- A. a frequency twice that of the first note
- B. frequency half that of the first note
- C. the same fundamental frequency as the first one
- D. a frequency frequency eight times that of the first note
Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
- A. diffraction
- B. interference
- C. refraction
- D. reflection
The equation of a wave is y = 0.005 sin[x(0.5X – 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?
- A. 4000ms-1
- B. 400ms-1
- C. 250ms-1
- D. 40ms-1
The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by
- A. convection
- B. radiation from the surface
- C. conduction through the stopper and the glass
- D. conduction across the walls
A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will
- A. increase
- B. remain the same
- C. decrease
- D. first decrease and then increase
How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg-1K-1 is heated from 20oC to 70oC?
- A. 39 . 98 x 10-1J
- B. 9.75 x 102J
- C. 3.98 x 103J
- D. 9.75 x 103J
At constant pressure, the density of a fixed mass of gas is
- A. constant with temperature
- B. proportional to its volume
- C. inversely proportional to its temperature
- D. independent of its volume
One of the most important applications of bi-metallic strip is found in the construction of
- A. a thermostat
- B. an altimeter
- C. a thermocouple
- D. a hydrometer
A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10°C and 35°C respectively. The linear expansivity of steel is 0.000012C\(^{-1}\).
- A. 0.18cm
- B. 1.80cm
- C. 18.00cm
- D. 1800cm
A platinum resistance thermometer wire has a resistance of 5 ohms at 0oC and 5.5 ohms at 100oC. Calculate the temperature of the wire when the resistance is 5.2 ohms
- A. 80oC
- B. 60oC
- C. 40oC
- D. 10oC
If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is
- A. 800kgm3
- B. 1200kgm3
- C. 1250kgm3
- D. 2000kgm3
In an experiment to determine Young’s Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the
- A. load and the extension
- B. load and the radius of the wire
- C. radius of the wire and the extension
- D. extension and the original length of the wire