1
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

In an experiment, the length of an object is measured to be 6.50 cm. This measured value can be written as 0.0650 m. The number of significant figures on 0.0650 m is

A
3
B
4
C
2
D
5
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A mouse of mass m jumps on the outside edge of a rotating ceiling fan of moment of inertia I and radius R. The fractional loss of angular velocity of the fan as a result is,

A
$$\frac{m R^{2}}{I+m R^{2}}$$
B
$$\frac{I}{I+m R^{2}}$$
C
$$\frac{I-m R^{2}}{I}$$
D
$$\frac{I-m R^{2}}{I+m R^{2}}$$
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Acceleration due to gravity at a height H from the surface of a planet is the same as that at a depth of H below the surface. If R be the radius of the planet, then H vs. R graph for different planets will be,

A
WB JEE 2023 Physics - Gravitation Question 1 English Option 1
B
WB JEE 2023 Physics - Gravitation Question 1 English Option 2
C
WB JEE 2023 Physics - Gravitation Question 1 English Option 3
D
WB JEE 2023 Physics - Gravitation Question 1 English Option 4
4
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A uniform rope of length 4 m and mass 0.4 kg is held on a frictionless table in such a way that 0.6 m of the rope is hanging over the edge. The work done to pull the hanging part of the rope on to the table is, (Assume g = 10 m/s$$^2$$)

A
0.36 J
B
0.24 J
C
0.12 J
D
0.18 J
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