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Question 1
A
Concave Mirror 
B
Concave lens 
C
Prism 
D
Convex lens 
Explanation.

No official Explanation yet!

Correct Option:
B

Question 2
A
Be a straight line 
B
Curve inwards 
C
Be a parabola 
D
Curve outwards 
Explanation.

No official Explanation yet!

Correct Option:
A

Question 3
A
Temperature decreases 
B
Slow evaporation 
C
Temperature increases 
D
Rapid evaporation 
Explanation.

No official Explanation yet!

Correct Option:
D

Question 4
A
\(\frac{g}{16}\) 
B
\(\frac{g}{4}\) 
C
\(\frac{4}{g}\) 
D
\(\frac{16}{g}\) 
Explanation.
\(\frac{g}{R^2}\) = \(\frac{g}{4^2}\) = \(\frac{g}{16}\)

Correct Option:
A

Question 5
A
I and II only 
B
II and III only 
C
I, II and III 
D
I and III only 
Explanation.

No official Explanation yet!

Correct Option:
D

Question 6
A
Is quadrupled 
B
Is halved 
C
Remains the same 
D
Is double 
Explanation.

No official Explanation yet!

Correct Option:
D

Question 7
A
80cm 
B
40cm 
C
50cm 
D
70cm 
Explanation.

No official Explanation yet!

Correct Option:
B

Question 8
A
Efficiency of a machine is always greater than I 
B
Efficiency decreases with an increase in friction 
C
Velocity ratio depends on friction 
D
Mechanical advantage increases with an increase in friction 
Explanation.

No official Explanation yet!

Correct Option:
B

Question 9
A
Prism binoculars 
B
Telescope 
C
Film projector 
D
Microscope 
Explanation.

No official Explanation yet!

Correct Option:
B

Question 10
A
60 
B
10 
C
30 
D
90 
Explanation.
M = \(\frac{y}{x}\) = \(\frac{30}{3}\)

= 10

Correct Option:
B

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