1
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A thin circular ring of mass M and radius R is rotating with a constant angular velocity 2 rads$$-$$1 in a horizontal plane about an axis vertical to its plane and passing through the center of the ring. If two objects each of mass m be attached gently to the opposite ends of a diameter of ring, the ring will then rotate with an angular velocity (in rads$$-$$1).

A
$${M \over {(M + m)}}$$
B
$${{(M + 2m)} \over {2M}}$$
C
$${{2M} \over {(M + 2m)}}$$
D
$${{2(M + 2m)} \over M}$$
2
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The variation of acceleration due to gravity (g) with distance (r) from the center of the earth is correctly represented by :

(Given R = radius of earth)

A
JEE Main 2022 (Online) 26th June Morning Shift Physics - Gravitation Question 67 English Option 1
B
JEE Main 2022 (Online) 26th June Morning Shift Physics - Gravitation Question 67 English Option 2
C
JEE Main 2022 (Online) 26th June Morning Shift Physics - Gravitation Question 67 English Option 3
D
JEE Main 2022 (Online) 26th June Morning Shift Physics - Gravitation Question 67 English Option 4
3
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The efficiency of a Carnot's engine, working between steam point and ice point, will be :

A
26.81%
B
37.81%
C
47.81%
D
57.81%
4
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Time period of a simple pendulum in a stationary lift is 'T'. If the lift accelerates with $${g \over 6}$$ vertically upwards then the time period will be :

(Where g = acceleration due to gravity)

A
$$\sqrt {{6 \over 5}} T$$
B
$$\sqrt {{5 \over 6}} T$$
C
$$\sqrt {{6 \over 7}} T$$
D
$$\sqrt {{7 \over 6}} T$$
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