Jamb Physics Past Questions
Question 2161
Ripples on water and light waves are similar because both?
- A. have the same frequency
- B. can be refracted and diffracted
- C. are longitudinal waves
- D. have the same velocity
Question 2162
What happens when a gas expands at constant temperature?
- A. its pressure decreases
- B. the total momentum of its molecules remains constant
- C. its pressure decreases and the total momentum of its moleculees remains constant
- D. its pressure decreses and the total kinetic energy of its molecule decreases
Question 2163
A mass of a liquid at 30oC is mixed with a mass of the same liquid at 70oC and the temperature of the mixture is 45oC. Find the ratio of the mass of the cold liquid to the mass of the other liquid.
- A. 3 : 5
- B. 5 : 3
- C. 3 : 7
- D. 7 : 3
Question 2164
A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 106Jkg-1]
- A. 1.15 x 109 s
- B. 1.15 x 107 s
- C. 1.15 x 105 s
- D. 1.15 x 104 s
Question 2165
Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave
- A. i, ii, iii and iv
- B. i, ii, iv only
- C. i, iii, iv only
- D. ii, iii, iv only
