1. Which one among the following has the highest energy? [CSE (Pre) 2009]

2. Consider the following natural phenomena [CSE (Pre) 2002. 1. Terrestrial heatin. 2. Reflection of ligh. 3. Refraction of ligh. 4. Diffraction of light Due to Which of these phenomena is mirage formed?

3. If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because [CSE (Pre) 2010]

4. Assertion (A) Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R) Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium. [CSE (Pre) 2000] Codes

5. Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simul-taneously, then which vessel is emptied first? [CSE (Pre) 2007]

6. Assertion (A) Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R) Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium. [CSE (Pre) 2000] Codes

7. When light waves pass from air to glass, the variables affected are [CSE (Pre) 2001]

8. Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps? [CSE (Pre) 2010]

9. Consider the following statements A simple pendulum is set into oscillation. Then [CSE (Pre) 2001] (1) The acceleration is zero when the bob passes through the mean position. (2) In each cycle, the bob attains a given velocity twice. (3) Both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation. (4) The amplitude of oscillation of the simple pendulum decreases with time. Which of these statements are correct?

10. Which one of the following types of waves are used in a night vision apparatus? [CSE (Pre) 2009]

11. Consider the following natural phenomena [CSE (Pre) 2002. 1. Terrestrial heatin. 2. Reflection of ligh. 3. Refraction of ligh. 4. Diffraction of light Due to Which of these phenomena is mirage formed?

12. When light waves pass from air to glass, the variables affected are [CSE (Pre) 2001]

13. Assertion (A) In the visible spectrum of light, red light is more energetic than green light. Reason (R) The wavelength of red light is more than that of green light. [CSE (Pre) 2008] Codes

14. Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps? [CSE (Pre) 2010]