PHYSICS | Study Mode

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

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

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

Question 44
A

C

B

D

C

B

D

A

Question 45
A

R

B

X

C

S

D

P

Question 46
A

4.78mm

B

4.16mm

C

4.66mm

D

4.70mm

Question 47
A

MP

B

SN

C

NS

D

PM

Explanation

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

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

Question 50
A
0.60H
B
2.50H
C
1.25H
D
0.04H