Q21. jaba ek vaayau y aana laU p banaa rha hao t a hO tao caalak igarta nahIM hO @yaao M i k ]saka vajana AavaSyak p` d ana krta hO :
When an aero plane is making a loop, pilot does not fall down because his
weight provides the necessary
(A) gau $ %va ko ivaprIt bala/Force against gravity
(B) AiBako n d` I bala/Centripetal force
(C) Apko n d` I bala/Centrifugal force
(D) Syaana bala /Viscous force
Ans : B
Q22. 70 ik ga` a ma d` v yamaana kI vastu pr 350 N ka Sau W bala kaya- krta hO jaao ik p` a rmBa mao M isqar Avasqaa mao M hO . [saka
%varNa _____ hao g aa .
A net force of 350 N acts on a body of mass 70 Kg which is initially at rest. Its
2
acceleration is ______ m/s
.
(A) 3
(B)
7
(C) 5
(D) 9
Ans : C
Q23. Qvaina ko dao sa` a o t Anau n aad mao M tba hao t o hO :
Two sources of sound are said to be in resonance, when
(A) jaba vao ek jaO s ao lagato hO M / They look like similar
jaba vao ek samaana AavaR i <a kI Qvaina ]%pnna krto hO M /They produce sound of same
(B)
frequency
jaba vao ek dU s aro sao ivaSao Y a dU r I pr isqat hao t o hO M /They are situated at a particular
(C)
distance from each other
jaba vao ek hI sa` a o t Wara ]%pnna hao t o hO M . /They are produced by same source
(D)
Ans : B
Q24. jaO s ao jaO s ao hma pR q vaI ko tla sao }pr kI Aao r jaato hO M tao gau $ %va ko karNa %varNa GaTta hO tao pR q vaI ko tla sao naIcao jaanao
pr yah :
Acceleration due to gravity decreases as we go up from the surface of the earth.
Then in going below the surface of the earth it
(A) baZ, t a hO / Increases
GaTta hO / Decreases
(B)
(C) isqar rhta hO /Remains constant
(D) GaTta hO ifr baZ, t a hO / Decreases then increases
Ans : B
Q25. pR q vaI ko vaayau m aM D la pr Aao j aao n a kI prt :
Ozone layer above earth’s atmosphere will
(A) saU y a- ko Avar@t ivaikrNa sao bacaaegaI/Prevent infra-red radiation from sun
(B) pR q vaI sao pravait- t Avar@t ikrNaao M sao pR q vaI ko vaayau m aM D la kao bacaaegaa /Infra-red rays reflected
from earth from escaping earth’s atmosphere
(C) saU y a- sao prabaO M g anaI ikrNaao M kao bacaaegaa /Prevent ultraviolet rays from sun
(D) ro i Dyaao trM g aao M kao vaaipsa pravait- t kro g aa /Reflect back radio waves
Ans : C