1
WB JEE 2024
MCQ (More than One Correct Answer)
+2
-0
Change Language
Monochromatic light of wavelength $$\lambda=4770 \mathop A\limits^o $$ is incident separately on the surfaces of four different metals A, B, C and D. The work functions of A, B, C and D are $$4.2 \mathrm{~eV}, 3.7 \mathrm{~eV}, 3.2 \mathrm{~eV}$$ and $$2.3 \mathrm{~eV}$$, respectively. The metal / metals from which electrons will be emitted is / are
A
A, B, C and D
B
B, C and D
C
C and D
D
D only
2
WB JEE 2024
MCQ (More than One Correct Answer)
+2
-0
Change Language

Consider the integral form of the Gauss' law in electrostatics

$$\oint {\overrightarrow E .d\overrightarrow S } = {Q \over {{\varepsilon _0}}}$$

Which of the following statements are correct?

A
It contains law of Coulomb.
B
It contains superposition principle.
C
An elementary patch on the enclosing surface is a polar vector.
D
An elementary patch on the enclosing surface is a pseudo-vector.
3
WB JEE 2024
MCQ (More than One Correct Answer)
+2
-0
Change Language

WB JEE 2024 Physics - Center of Mass Question 2 English

A uniform rod $$\mathrm{AB}$$ of length $$1 \mathrm{~m}$$ and mass $$4 \mathrm{~kg}$$ is sliding along two mutually perpendicular frictionless walls OX and OY. The velocity of the two ends of the $$\operatorname{rod} \mathrm{A}$$ and $$\mathrm{B}$$ are $$3 \mathrm{~m} / \mathrm{s}$$ and $$4 \mathrm{~m} / \mathrm{s}$$ respectively, as shown in the figure. Then which of the following statement(s) is/are correct?

A
The velocity of the centre of mass of the rod is $$2.5 \mathrm{~m} / \mathrm{s}$$.
B
Rotational kinetic energy of the rod is $$\frac{25}{6}$$ joule.
C
The angular velocity of the rod is $$5 \mathrm{~rad} / \mathrm{s}$$ clockwise.
D
The angular velocity of the rod is $$5 \mathrm{~rad} / \mathrm{s}$$ anticlockwise.
4
WB JEE 2024
MCQ (More than One Correct Answer)
+2
-0
Change Language

WB JEE 2024 Physics - Alternating Current Question 1 English

The variation of impedance $$\mathrm{Z}$$ of a series $$\mathrm{L C R}$$ circuit with frequency of the source is shown in the figure. Which of the following statement(s) is/are true ?

A
The impedance $$\mathrm{Z}$$ is inductive in the portion $$\mathrm{AC}$$
B
The impedance $$\mathrm{Z}$$ is capacitive in the portion $$\mathrm{BC}$$
C
The impedance $$\mathrm{Z}$$ is inductive in the portion $$\mathrm{BC}$$
D
The impedance $$\mathrm{Z}$$ is capacitive in the portion $$\mathrm{AC}$$
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12