1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Which of the following statement(s) is/are truc in respect of nuclear binding energy ?

(i) The mass energy of a nucleus is larger than the total mass energy of its individual protons and neutrons.

(ii) If a nucleus could be separated into its nucleons, an energy equal to the binding energy would have to be transferred to the particles during the separating process.

(iii) The binding energy is a measure of how well the nucleons in a nucleus are held together.

(iv) The nuclear fission is somehow related to acquiring higher binding energy.

A
Statements (i), (ii) and (iii) are true
B
Statements (ii), (iii) and (iv) are true
C
Statements (ii) and (iii) are true
D
All the four statements are true
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A satellite of mass $$\mathrm{m}$$ rotates round the earth in a circular orbit of radius R. If the angular momentum of the satellite is J, then its kinetic energy $$(\mathrm{K})$$ and the total energy (E) of the satellite are

A
$$\mathrm{K}=\frac{\mathrm{J}^2}{\mathrm{mR}^2}, \mathrm{E}=-\frac{\mathrm{J}^2}{2 \mathrm{mR}^2}$$
B
$$\mathrm{K}=\frac{\mathrm{J}^2}{2 \mathrm{mR}^2}, \mathrm{E}=-\frac{\mathrm{J}^2}{2 \mathrm{mR}^2}$$
C
$$\mathrm{K}=\frac{\mathrm{J}^2}{2 \mathrm{mR}^2}, \mathrm{E}=-\frac{\mathrm{J}^2}{\mathrm{mR}^2}$$
D
$$K=\frac{J^2}{2 \mathrm{mR}^2}, E=\frac{J^2}{\mathrm{mR}^2}$$
3
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

What force $$\mathrm{F}$$ is required to start moving this $$10 \mathrm{~kg}$$ block shown in the figure if it acts at an angle of $$60^{\circ}$$ as shown? $$(\mu_s=0.6)$$

WB JEE 2024 Physics - Laws of Motion Question 1 English

A
22.72 N
B
24.97 N
C
25.56 N
D
27.32 N
4
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Light of wavelength $$6000 \mathop A\limits^o$$ is incident on a thin glass plate of r.i. 1.5 such that the angle of refraction into the plate is $$60^{\circ}$$. Calculate the smallest thickness of the plate which will make dark fringe by reflected beam interference.

A
$$1.5 \times 10^{-7} \mathrm{~m}$$
B
$$2 \times 10^{-7} \mathrm{~m}$$
C
$$3.5 \times 10^{-7} \mathrm{~m}$$
D
$$4 \times 10^{-7} \mathrm{~m}$$
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