19.
The instrument used for measuring the force and velocity of wind is
Answer : C. Anemometer
20.
Match List I correctly with List II and select your answer using the codes given below
Answer : B. a-3 ,b-2 ,c-4 ,d-1
21.
Sonometer can be used to determine
Answer : D. the frequency of a tuning fork
22.
the device used to measure voltage,current and resistance is called
Answer : D. A multimeter
23.
Hydrometer is used to measure?
Answer : D. specific gravity of liquids
24.
The apparatus used in submarines to give clear view of the objects on the surface of the ocean or ground is known as
Answer : A. Periscope
