Q1.Light travels slower in glass than in air because
(a) refractive index of air is less than that of glass
(b) refractive index of air is greater than that of glass
(c) density of glass is greater than that of air
(d) density of glass is less than that of airQ2. Yellow colour light is used as fog light because yellow colour
(a) light is most scattered by fog
(b) has the longest wavelength among all colours
(c) has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red
(d) has the shortest wavelength among all colours not already reserved for other purposeQ3. Why does one experience a strong shock when one accidentally touches a live wire of, say, 220 V?
(a) The resistance of human body is very low
(b) The resistance of human body is very high
(c) The human body is sensitive to even feeble currents
(d) The human body is sensitive to large currents only Q4. Two similar poles repel each other with a force of 0.005 N when placed 16 cm apart. If they are placed 8 cm apart, what will be the repulsing force?
(a) 0.001 N
(b) 0.002 N
(c) 0.01 N
(d) 0.02 N Q5. The electric charge is stored in a device called
(d) TransformerQ6. Magnetism of a bar magnet can be destroyed if it is
I. kept in the magnetic meridian.
II. placed in a direction opposite to that of the Earth’s horizontal intensity.
III. heated to a temperature known as Curie temperature.
Select the correct answer using the code given below
(a) I and III only
(b) II only
(c) II and III only
(d) I, II and IIIQ7. Kilowatt- hour is the unit of
(a) potential difference
(b) electric power
(c) electric energy
(d) electric potentialQ8. Consider the following statements:
1. If a piece of bar magnet is broken into two equally long pieces, the pieces will not lose the magnetic properties.
2. Magnetic properties of a substance lie in the atomic level.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2Q9. 6. Which one of the following is the most effective carrier of information?
(c) Radio waves
(d) Optical fibres Q10. Which one of the following statements is correct?
(a) Only electrons reside inside the nucleus of an atom
(b) Both electrons and protons reside inside the nucleus of an atom
(c) Only neutrons reside inside the nucleus of an atom
(d) Both protons and neutrons can reside inside the nucleus of an atomQ11. One litre of an unknown gas weighs 1.25 g at STP. Which one of the following can be the formula for the gas?
(d) SO2 Q12. The octet rule is not valid for which one of the following molecules?
1. (a)2. (c)3. 4. (d)5. (b)6. (c)7. (c)8. (c)9. (d)10. (d)11. (b)12. (d)