physics

Question 1

when a body moves in a circle, the angle b/w its linear velocity 𝑣 and angular velocity ω is

Answer 1

90°

Question 2

the efficiency of carnot engine depends upon

Answer 2

both source and sink temperature

Question 3

distance b/w two consecutive nodes

Answer 3

λ / 2

Question 4

i.(j x k) =

Answer 4

1

Question 5

one geostationary satellite covers a longitude of

Answer 5

120°

Question 6

the frequency of second’s pendulum is

Answer 6

0.5 Hz

Question 7

what particle has greatest speed

Answer 7

gamma particles

Question 7

for a body thrown vertically upwards, the time to reach maximum height is given by the formula:

Answer 7

t = u/g
(t=time, u=initial velocity, g=9.8)

Question 8

min speed required to leave earth

Answer 8

40,000 km/hr

Question 9

what method of heat transfer can take place in a vacuum

Answer 9

radiation

Question 10

what electromagnetic radiation transmits the highest photon energy

Answer 10

gamma rays

Question 11

greenhouse gases absorb ________ radiation

Answer 11

infrared

Question 12

if we add all colours of the rainbow what is the resultant colour

Answer 12

white

Question 13

when white light passes through a prism it splits into how many colours

Answer 13

7

Question 14

what lens does a camera use to form an image on a piece of film at the back

Answer 14

convex lens

Question 15

short sighted defect could be corrected by a

Answer 15

concave lens

Question 16

in humans, heart functions as a source of

Answer 16

electromotive force

Question 17

ozone layer protects the earth from

Answer 17

ultraviolet radiations from the sun

Question 18

what is the distance b/w moon and earth

Answer 18

384,000 km

Question 19

how many planets orbit the sun

Answer 19

8

Question 20

what keeps planets in orbit

Answer 20

gravitational pull of the sun

Question 21

examples of renewable energy

Answer 21

• geothermal energy
• solar energy
• bio fuels

Question 22

name the process where vapors of a substance are cooled and turned into liquid

Answer 22

condensation

Question 23

instrument used to measure gas pressure

Answer 23

manometer

Question 24

adding salt to pure water ___________ its boiling point

Answer 24

increases

Question 25

boiling point of alcohol

Answer 25

79°C

Question 26

presence of impurities ___________ the freezing point of water

Answer 26

decreases