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Question 781
A
take place at any temperature 
B
are surface phenomena 
C
involve change of state 
D
take place at a definite pressure 
Explanation.
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No official Explanation yet!


Correct Option:
C


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Question 783
A
high coefficient of expansion 
B
good conduction of heat 
C
low specific heat capacity 
D
poor radiation of heat 
Explanation.
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No official Explanation yet!


Correct Option:
B

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Question 784
A
150cm3 
B
273cm3 
C
327cm3 
D
600cm3 
Explanation.
Share Answer \(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\)

\(\frac{300}{27 + 273}\) = \(\frac{V_2}{54 + 273}\)

V2 = 327cm3

Correct Option:
C

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Question 785
A
1 : 4 
B
4 : 1 
C
1 : 1 
D
2 : 1 
Explanation.
Share Answer \(\theta\)p = 2\(\theta\)q

mq = 2mp

Cp X mp X \(\theta\)p = Cq x mq x \(\theta\)q

\(\frac {C_pm_q\theta q}{C_qm_p \theta q}\) = \(\frac {\theta q \times 2mp}{2 \theta qmp}\)

\(\frac {C_p}{Cq}\) = \(\frac {2}{2}\)

Correct Option:
C

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Question 786
A
sound travels faster in air at 20oC than at 30o
B
the frequency of a given sound wave changes when it crosses the boundary seperating two media 
C
the wavelength of a given sound wave in air decreases as the temperature increases 
D
sound waves cannot be reflected 
Explanation.
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No official Explanation yet!


Correct Option:
C

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Question 787
A
8.0cm 
B
16.0cm 
C
24.0cm 
D
32.0cm 
Explanation.
Share Answer F = 12cm, V = 3u

F = \(\frac{uv}{u + v}\)

12 = \(\frac{u\times 3u}{u + 3v}\)

u = 16cm, and v = 48cm

therefore, distance between u and v

v = 48 - 16 = 32cm

Correct Option:
D

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Question 788
A
Gamma rays, infra-red rays, x-rays, radiowaves 
B
Gamma rays, x-rays, infra-red ray, radiowaves 
C
Radiowaves, x-rays, gamma ray, infra-red rays 
D
Infra-red rays, radiowaves, x-rays, gamma rays 
Explanation.
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No official Explanation yet!


Correct Option:
B

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Question 789
A
sin-1\(\frac{1}{2}\) 
B
sin-1\(\frac{2}{3}\) 
C
sin-1\(\frac{3}{4}\) 
D
sin-1\(\frac{8}{9}\) 
Explanation.
Share Answer sin ic \(\frac{1}{n}\) = \(\frac{1}{1 - 5}\)

i = sin-1\(\frac{1}{1 - 5}\)

= sin-1\(\frac{10}{15}\)

= sin-1\(\frac{2}{3}\)

Correct Option:
B

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Question 790
A
5.3cm 
B
3.2cm 
C
2.7cm 
D
1.6cm 
Explanation.
Share Answer v = 4u, if u = 2cm, v = 8cm

F = \(\frac{uv}{u + v}\)

= \(\frac{2 \times 8}{2 + 8}\)

= 1.6cm

r = 2F

= 2 x 1.6

= 3.2cm

Correct Option:
B

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