1. Consider the following statements [CSE (Pre) 2002] (1) Light of longer wavelength is scattered much more than the light of shorter wavelength. (2) The speed of visible light in water is 0.95 times the speed in vacuum. (3) Radio waves are produced by rapidly oscillating electrical current. (4) To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves. Which of these statements are correct?

2. Assertion (A) A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece. Reason (R) The density of copper is more than that of glass. [CSE (Pre) 2001] Codes

3. Consider the following statements [CSE (Pre) 2003. 1. Steam at 100°C and boiling water at 100°C contain same amount of heat. 2. Latent heat of fusion of ice is equal to the latent heat of vaporisation of water. 3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils. Which of these statements is/are correct?

4. Assertion (A) In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R) An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus. [CSE (Pre) 2000] Codes

5. Two wires have their lengths, diameters and resistivities all in the ratio of 1:2. If the resistance of the thiner wire is 10 W, then the resistance of the thicker wire is [CSE (Pre) 2001]

6. A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R, made up of the same material, are all heated to 20°C above room temperature. When left to cool in the room, which of them will reach the room temperature first? [CSE (Pre) 2002]

7. Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? [CSE (Pre) 2013. 1. Dispersio. 2. Refractio. 3. Internal reflection Select the correct answer using the codes given below

8. Assertion (A) An iron ball floats on mercury but gets immersed in water. Reason (R) The specific gravity of iron is more than that of mercury. [CSE (Pre) 2002] Codes

9. Ball bearings are used in bicycles, cars, etc., because [CSE (Pre) 2013]

10. Ball bearings are used in bicycles, cars, etc., because [CSE (Pre) 2013]

11. Regarding the atom of a chemical element, magnetic quantum number refers to [CSE (Pre) 2003]

12. With reference to technologies for solar power production, consider the following statements [CSE (Pre) 2014. 1. 'Photovoltaic' is a technology that generates electricity by direct conversion of light into electricity, while 'Solar Thermal' is a technology that utilises the Sun's rays to generate heat which is further used in electricity generation process. 2. Photovoltaic generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC). 3. India has manufacturing base for Solar Thermal technology, but not for Photovoltaic. Which of the statements given above is/are correct?

13. Regarding the atom of a chemical element, magnetic quantum number refers to [CSE (Pre) 2003]

14. Consider the following statements in respect of a jet engine and a rocket. [CSE (Pre) 2008] I. A jet engine uses the surrounding air for its oxygen supply and so, it is. unsuitable for motion in space. II. A rocket carries its own supply of oxygen in the gas form and fuel. Which of the statements given above is/are correct?

15. Consider the following statements [CSE (Pre) 2002] (1) Light of longer wavelength is scattered much more than the light of shorter wavelength. (2) The speed of visible light in water is 0.95 times the speed in vacuum. (3) Radio waves are produced by rapidly oscillating electrical current. (4) To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves. Which of these statements are correct?

16. Consider the following statements [CSE (Pre) 2003. 1. Steam at 100°C and boiling water at 100°C contain same amount of heat. 2. Latent heat of fusion of ice is equal to the latent heat of vaporisation of water. 3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils. Which of these statements is/are correct?

17. Two wires have their lengths, diameters and resistivities all in the ratio of 1:2. If the resistance of the thiner wire is 10 W, then the resistance of the thicker wire is [CSE (Pre) 2001]

18. Consider the following statements in respect of a jet engine and a rocket. [CSE (Pre) 2008] I. A jet engine uses the surrounding air for its oxygen supply and so, it is. unsuitable for motion in space. II. A rocket carries its own supply of oxygen in the gas form and fuel. Which of the statements given above is/are correct?

19. Match List I with List II and select the correct answer using the codes given below the list. [CSE (Pre) 2000] List I (Characteristic) List II (Particle) A. Zero mass 1. Positron B. Fractional charge 2. Neutrino C. Fractional spin 3. Quark D. Integral spin 4. Photon Codes A B C D

20. What is the order of magnitude of electric resistance of the human body (dry)? [CSE (Pre) 2005]

21. What is the principle by which a cooling system (radiator) in a motor car works? [CSE (Pre) 2010]