Q: 48 (CAPF/2010)

Match List-I with List-II and select the correct answer using the code given below the lists :
List-I (Phenomenon)
A. Reverberation
B. Resonance
C. Refraction
List-II (Reason)
1. Occurs when. two waves of equal frequency superpose
2. Occurs when two waves have slightly diffe- rent frequencies superpose
3. Prolonged echo of light
4. Occurs as a ray of light enters a second medium
Code : ABC
question_subject: 
Science
question_year: 
2010
question_exam: 
CAPF
stats: 
0,256,464,80,64,320,256