1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A parallel plate capacitor has plate area 40 cm$$^2$$ and plates separation 2 mm. The space between the plates is filled with a dielectric medium of a thickness 1 mm and dielectric constant 5. The capacitance of the system is :

A
$$\mathrm{10\varepsilon_0~F}$$
B
$$\mathrm{24\varepsilon_0~F}$$
C
$$\mathrm{\frac{3}{10}\varepsilon_0~F}$$
D
$$\mathrm{\frac{10}{3}\varepsilon_0~F}$$
2
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I List II
A. Surface tension I. $$\mathrm{kg~m^{-1}~s^{-1}}$$
B. Pressure II. $$\mathrm{kg~ms^{-1}}$$
C. Viscosity III. $$\mathrm{kg~m^{-1}~s^{-2}}$$
D. Impulse IV. $$\mathrm{kg~s^{-2}}$$

Choose the correct answer from the options given below :

A
A-IV, B-III, C-I, D-II
B
A-IV, B-III, C-II, D-I
C
A-I, B-I, C-III, D-IV
D
A-III, B-IV, C-I, D-II
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The root mean square velocity of molecules of gas is

A
Proportional to temperature ($$T$$)
B
Inversely proportional to square root of temperature $$\left( {\sqrt {{1 \over T}} } \right)$$
C
Proportional to square of temperature ($$T^2$$)
D
Proportional to square root of temperature ($$\sqrt T$$)
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Photodiodes are used in forward bias usually for measuring the light intensity.

Reason R : For a p-n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for $$\mathrm{|{V_z}| > \pm v \ge |{v_0}|}$$ where $$\mathrm{v_0}$$ is the threshold voltage and $$\mathrm{V_z}$$ is the breakdown voltage.

In the light of the above statements, choose the correct answer from the options given below

A
Both A and R are true but R is NOT the correct explanation of A
B
A is true but R is false
C
Both A and R are true and R is the correct explanation of A
D
A is false but R is true
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