1
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A 750 Hz, 20 V (rms) source is connected to a resistance of 100 $$\Omega $$, an inductance of 0.1803 H and a capacitance of 10 $$\mu $$F all in series. The time in which the resistance (heat capacity 2 J/oC) will get heated by 10oC. (assume no loss of heat to the surroudnings) is close to :
A
348 s
B
418 s
C
245 s
D
365 s
2
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is
A
$${3 \over 4}$$
B
$${4 \over 5}$$
C
$${3 \over 5}$$
D
$${7 \over 8}$$
3
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Pressure inside two soap bubbles are 1.01 and 1.02 atmosphere, respectively. The ratio of their volumes is :
A
4 : 1
B
8 : 1
C
2 : 1
D
0.8 : 1
4
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A balloon filled with helium (32oC and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as
A
Irreversible adiabatic
B
Reversible adiabatic
C
Irreversible isothermal
D
Reversible isothermal
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