Question

Class: X
Sub: General Science
Marks: 80
Time:3:15Mins,
PART-A:PHYSICS
I.Choose the correct alternative and complete answer :-
4x1=4
1. The suitable focal length of the convex lens used as magnifying lens to read "Hallmark
916" written on ornaments is:
C.100cm
D.120cm
A, 12cm
B.60cm
2. The source of energy in nuclear power Reactor is:
A. Nuclear Fission Reaction
B. Exothermic Chemical Reaction
C. Nuclear Fusion Reaction
D. Controlled Fission Chain Reaction
3. The value of 1Dioptre is
C.1mm
D.1km
A.lm
B.lcm
4.The lens formula is
B В
A-
B. -
D.
C.
為
2x1-2
II. Answer the following questions:-​

Answer 1

Answer:

1mm

nj

Explanation:

1mm is the high high in to of tk of to

Answer 2

Answer:

1.a 12cm

2a nuclear fission reaction

3.a1m

4.p=1/f