PHYSICS | Study Mode

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Question 21
A
30cm
B
10cm
C
20cm
D
25m
Explanation
Clockwise moment = Anti-clockwise moment
10 x 30 = 15 x X
X = 20cm

Correct option: C
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Question 22
A
30s
B
20s
C
25s
D
15s
Explanation
t = \(\frac{u sin\theta}{g}\) = \(\frac{300 \text {sin} 30}{10}\) = 15s

Correct option: D
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Question 23
A
40s
B
10s
C
20s
D
5s
Explanation
t = \(\frac{v - u}{a}\) = \(\frac{20 - 0}{2}\)

= 10s

Correct option: B
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Question 24
A
Visible Light
B
Ultraviolet rays
C
Infrared rays
D
Gamma rays
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: D
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Question 25
A
5.93 x 106s
B
6.93 x 107s
C
6.93 x 109s
D
5.93 x 107s
Explanation
t1/2 = \(\frac{0.693}{\gamma}\) = \(\frac{0.693}{10^-6}\)

= 6.93 x 107

Correct option: B
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Question 26
A
Water waves
B
Radio waves
C
Sound waves
D
X-rays
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A
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Question 27
A
201oC
B
126oC
C
153oC
D
185oC
Explanation
T = \(\frac{PV}{nR}\) = \(\frac{7.6 x 10^6 x 10^-3}{6 x 8.3}\)

= 153oC

Correct option: C
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Question 28
A
Mass of water to the mass of an equal volume of liquid
B
Upthrust in the liquid to the upthrust in water
C
Density of water to the density of the liquid
D
Upthrust in water to the upthrust in the liquid
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 29
A
It will decrease
B
it will drop to zero
C
It will increase
D
It will remain constant
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 30
A
Lead acid accumulator
B
An electric bell
C
A moving coil galvanometer
D
A telephone receiver
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A

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