1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A capacitance of 2 $$\mu $$F is required in an electrical circuit across a potential difference of 1.0 kV. A large number of 1 $$\mu $$F capacitors are available which can withstand a potential difference of not more than 300 V. The minimum number of capacitors required to achieve this is:
A
2
B
16
C
32
D
24
2
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
An electron beam is accelerated by a potential difference V to hit a metallic target to produce X–rays. It produces continuous as well as characteristic X-rays. If $$\lambda $$min is the smallest possible wavelength of X-ray in the spectrum, the variation of log$$\lambda $$min with log V is correctly represented in:
A
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 172 English Option 1
B
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 172 English Option 2
C
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 172 English Option 3
D
JEE Main 2017 (Offline) Physics - Dual Nature of Radiation Question 172 English Option 4
3
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
CP and Cv are specific heats at constant pressure and constant volume respectively. It is observed that
CP – Cv = a for hydrogen gas
CP – Cv = b for nitrogen gas
The correct relation between a and b is
A
a = 28 b
B
a = 1/14 b
C
a = b
D
a = 14 b
4
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The temperature of an open room of volume 30 m3 increases from 17oC to 27oC due to the sunshine. The atmospheric pressure in the room remains 1 $$ \times $$ 105 Pa. If Ni and Nf are the number of molecules in the room before and after heating, then Nf – Ni will be :
A
- 1.61 $$ \times $$ 1023
B
1.38 $$ \times $$ 1023
C
2.5 $$ \times $$ 1025
D
- 2.5 $$ \times $$ 1025
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