1
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the diagram, the total electric flux through the closed surface ' S ' is

[Given $\mathrm{q}=$ charge

$\varepsilon_0=$ permittivity of free space]MHT CET (PCB) 2024 22th April Morning Shift Physics - Electrostatics Question 5 English

A
$\frac{q}{\varepsilon_0}$
B
$\frac{-2 q}{\varepsilon_0}$
C
$\frac{-q}{\varepsilon_0}$
D
$\frac{3 q}{\varepsilon_0}$
2
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

If an electron in hydrogen atom jumps from $3^{\text {rd }}$ orbit to $2^{\text {nd }}$ orbit it emits a photon of wavelength ' $\lambda$ '. When it emits a photon from $4^{\text {th }}$ orbit to $3^{\text {rd }}$ orbit then the corresponding wavelength of emitted photon will be

A
$\frac{16}{25} \lambda$
B
$\frac{9}{16} \lambda$
C
$\frac{20}{7} \lambda$
D
$\frac{20}{13} \lambda$
3
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

A solenoid having 400 turns/metre has a core of a material with relative permeability 300 . If a current of 0.5 A is passed through it, then the magnetisation of the core material is nearly

A
$6 \times 10^2 \mathrm{~A} / \mathrm{m}$
B
$6 \times 10^3 \mathrm{~A} / \mathrm{m}$
C
$6 \times 10^4 \mathrm{~A} / \mathrm{m}$
D
$6 \times 10^5 \mathrm{~A} / \mathrm{m}$
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

The volume of a block of metal at $30^{\circ} \mathrm{C}$ changes by $0.12 \%$ when its temperature is increased to $70^{\circ} \mathrm{C}$. The coefficient of linear expansion of the metal is

A
$2 \times 10^{-5}{ }^{\circ} \mathrm{C}$
B
$3 \times 10^{-5}{ }^{\circ} \mathrm{C}$
C
$4 \times 10^{-5}{ }^{\circ} \mathrm{C}$
D
$1 \times 10^{-5}{ }^{\circ} \mathrm{C}$

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