Q1.The Visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belongs?
(b) Gamma ray
(d) UltravioletQ2. When light waves travel from air to glass, which variables are affected?
(a) Wavelength, frequency and velocity
(b) Velocity and frequency only
(c) Wavelength and frequency only
(d) Wavelength and velocity only Q3. What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as?
(a) Hubble telescope
(b) Kepler telescope
(c) Copernicus telescope
(d) Newton telescopeQ4. A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a
(a) converging lens
(b) diverging lens
(c) Plano-converging lens
(d) Plano-diverging LenQ5. The mirror used for the head light of a car is
(a) spherical concave
(d) parabolic concaveQ6. Which one of the following statements is correct? The space surrounding a charge in uniform motion has
(a) only an electric field
(b) only a magnetic field
(c) both electric and magnetic fields
(d) neither an electric field nor a magnetic field Q7. Which one of the following is correct? A negatively charged glass rod has always
(a) less electrons than protons
(b) less electrons than neutrons
(c) less protons than electrons
(d) less neutrons than protons Q8. Capacity of a parallel plate condenser can be doubled by
I. doubling the areas of the plates.
II doubling the distance of separation between the plates.
III. reducing the distance of separation between the plates to half the original separation.
IV. doubling both the areas of the plates and the distance of separation between the plates.
Select the correct answer using the code given below
(a) I and IV
(b) I and III
(c) III only
(d) II and IIIQ9. Three resistance coils of 1 ohm, 2 ohm and 3 ohm are connected in series. If the combination is connected to a battery of 9 V, what is the potential drop across the resistance coil of 3 ohm?
(a) 2.0 volt
(b) 3.0 volt
(c) 4.5 volt
(d) 6.0 voltQ10. When an electrical safety fuse is rated (marked) as 16 A, it means it
(a) will not work if current is less than 16 A
(b) has a resistance of 16 W
(c) will work if the temperature is more than 16°C
(d) will be blown (break) if current exceeds 16 AQ11. 7. Which one of the following is not the characteristic of X-rays?
(a) No medium is required for their propagation
(b) They obey laws of reflection
(c) They travel with the speed of light waves
(d) They are longitudinal in nature Q12. The ratio of velocity of X-rays to that of gamma rays
(a) is < 1
(b) is > 1
(c) is 1
(d) depends upon the ratio of their frequencies
1. (a)2. (d)3. (a)4. (b)5. (d)6. (c)7. (c)8. (b)9. (c)10. (d)11. (d)12.