1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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The electric current in a circular coil of four turns produces a magnetic induction 32 T at its centre. The coil is unwound and is rewound into a circular coil of single turn, the magnetic induction at the centre of the coil by the same current will be :

A
2 T
B
4 T
C
8 T
D
16 T
2
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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A fully loaded boeing aircraft has a mass of $$5.4\times10^5$$ kg. Its total wing area is 500 m$$^2$$. It is in level flight with a speed of 1080 km/h. If the density of air $$\rho$$ is 1.2 kg m$$^{-3}$$, the fractional increase in the speed of the air on the upper surface of the wing relative to the lower surface in percentage will be. ($$\mathrm{g=10~m/s^2}$$)

A
16
B
8
C
6
D
10
3
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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For the given logic gates combination, the correct truth table will be

JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 30 English

A
JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 30 English Option 1
B
JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 30 English Option 2
C
JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 30 English Option 3
D
JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 30 English Option 4
4
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

At 300 K, the rms speed of oxygen molecules is $$\sqrt {{{\alpha + 5} \over \alpha }} $$ times to that of its average speed in the gas. Then, the value of $$\alpha$$ will be

(used $$\pi = {{22} \over 7}$$)

A
27
B
28
C
24
D
32
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