1
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An ideal gas is enclosed in a cylinder at pressure of 2 atm and temperature 300 K. The mean time between two successive collisions is 6 $$ \times $$ 10–8 s. If the pressure is doubled and temperature is increased to 500 K, the mean time between two successive collisions will be close to
A
0.5 $$ \times $$ 10$$-$$8 s
B
4 $$ \times $$ 10$$-$$8 s
C
3 $$ \times $$ 10$$-$$6 s
D
2 $$ \times $$ 10$$-$$7 s
2
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Capacitor Question 106 English
When is the value of current at t = 4 s ?
A
zero
B
1.5 $$\mu $$A
C
2 $$\mu $$A
D
3 $$\mu $$A
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Formation of real image using a biconvex lens is shown below :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Geometrical Optics Question 147 English

If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen ?
A
Image disappears
B
Magnified image
C
Erect real image
D
No change
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the above circuit, C = $${{\sqrt 3 } \over 2}$$$$\mu $$F, R2 = 20 $$\Omega $$, L = $${{\sqrt 3 } \over {10}}$$ H and R1 = 10 $$\Omega $$. Current in L-R1 path is I1 and in C-R2 path it is I2 . The voltage of A.C. source is given by, V = 200 $${\sqrt 2 }$$ sin (100 t) volts . The phase difference between I1 and I2 is :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Alternating Current Question 137 English
A
150o
B
90o
C
30o
D
0o
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