PHYSICS | Study Mode

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Question 41
A
At the evaporation point
B
Less than the atmospheric pressure
C
Greater than the atmospheric pressure
D
Equal to the atmospheric pressure
Explanation

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Correct option: D
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Question 42
A

10cm

B

20cm

C

25cm

D

15cm

Explanation

M = \(\frac{v}{u}\) = 3 = \(\frac{v}{30}\). V = 30m

\(\frac{1}{u}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\) = \(\frac{1}{10}\) - \(\frac{1}{30}\) = \(\frac{1}{f}\)

\(\frac{3 - 1}{30}\) = \(\frac{1}{f}\)

f = \(\frac{30}{2}\) = 15cm


Correct option: D
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Question 43
A
1.41eV
B
1.71eV
C
1.61eV
D
1.51eV
Explanation
E = \(\frac{E_o}{n^2}\) = \(\frac{13.6}{3^2}\) = \(\frac{13.6eV}{9}\)

= 1.51eV

Correct option: D
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Question 44
PHYSICS Q 44 image
A

C

B

D

C

B

D

A

Explanation

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Correct option: C
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Question 45
PHYSICS Q 45 image
A

R

B

X

C

S

D

P

Explanation

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Correct option: B
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Question 46
PHYSICS Q 46 image
A

4.78mm

B

4.16mm

C

4.66mm

D

4.70mm

Explanation

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Correct option: B
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Question 47
PHYSICS Q 47 image
A

MP

B

SN

C

NS

D

PM

Explanation

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Correct option: C
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Question 48
A
Atom of different elements have different atomic weights
B
The mass of an atom is concentrated in the nucleus
C
An atom is made up of a nucleus and number of electrons
D
Atoms of all elements are identical
Explanation

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Correct option: D
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Question 49
A
6Hz
B
264Hz
C
528Hz
D
12Hz
Explanation
Beat = f2 - f1 = 270 - 258 = 12Hz

Correct option: D
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Question 50
A
0.60H
B
2.50H
C
1.25H
D
0.04H
Explanation

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Correct option: D

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