
Q1. Ohm’s law defines
(a) Resistance only
(b) Current only
(c) Voltage only
(d) all of the above
Q2. An air bubble inside water behaves like a
(a) Convex lens
(b) Convex mirror
(c) Concave mirror
(d) Concave lens
Q3. LED and CFL are very commonly used as sources of light in homes. Which of the following statements is true?
(a) LED is better because CFL contains toxic materials
(b) Both are equally good
(c) Neither of them is good because both contain toxic materials
(d) CFL is better because LED contains toxic materials
Q4. A laboratory thermometer shows five small divisions between the markings of 55°C and 56°C. This means that the thermometer can read correctly up to.
(a) 55.2°C
(b) 55.25°C
(c) 55.1°C
(d) 55.5°C
Q5. Which of the following is used in place of an ‘electric fuse’?
(a) A small piece of wire having high melting point
(b) Miniature circuit breaker
(c) An ISI-marked electric switch
(d) A small piece of insulating material
Q6. Geothermal energy is an alternative source of energy. For this energy, the most feasible regions are those that
(a) Have thermal power plants
(b) Are over hot spots in the crust
(c) Are near the coastal regions
(d) Have coal mines
Q7. Impression of an image persists on the retina of human eye for about
(a) 1/16 s
(b) 1/25 s
(c) 1 s
(d) 1/2 s
Q8. The image of a distance coloured object formed in a pinhole camera is always
(a) Virtual, erect, coloured and diminished
(b) Real, erect, coloured and diminished
(c) Real, inverted, black and white and diminished
(d) Real, inverted, coloured and diminished
Q9. Select the group of poor conductors of heat form the following:
(a) Air, water, plastic
(b) Wool, wood, iron
(c) Water, copper, wood
(d) Air, aluminium, wool
Q10. The air near a heat source gets hot and rises. The air from the sides comes into take its place. This is the way in which the air gets heated by oil heaters. What is this process called?
(a) Convection
(b) Radiation
(c) Diffusion
(d) Conduction
S1. Ans.(d)
Sol.
S2. Ans.(d)
Sol.
S3. Ans.(a)
Sol.
S4. Ans.(a)
Sol.

Thermometer
We can see that the thermometer can read correctly up to 55.2°C.
S5. Ans.(b)
Sol.
S6. Ans.(b)
Sol.
S7. Ans.(a)
Sol.
S8. Ans.(d)
Sol.
S9. Ans.(a)
Sol.
S10. Ans.(a)
Sol.