Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations - Category Wise Question And Answer Practice Test With Solutions

Question : 11 [BPSC (Pre) 2000]

Reading glasses are made from which type of lenses?

a) Plain

b) Convex

c) Concave

d) None of these

Question : 12

Match List I with List II and select the correct answer using the codes given below the lists.

a) A – 4, B – 1, C – 2, D – 3

b) A – 2, B – 1, C – 4, D – 3

c) A – 2, B – 3, C – 4, D – 1

d) A – 4, B – 3, C – 2, D – 1

Question : 13 [PSC (Pre) 2018]

The concept of expanding universe is based on

a) Zeeman effect

b) Stark effect

c) Doppler effect

d) Raman effect

Question : 14 [UPPCS (Pre) 2006]

Expansion during heating

a) Increases the weight of the material

b) Decreases the density of the material

c) Occurs only in solid

d) Occurs at the same rate for all liquids and solids

Question : 15

Two pulses travel in mutually opposite directions in a string with a speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10 cm apart. What will be the state of the string after two seconds

a)

b)

c)

d)