1
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When an electron is accelerated through a potential '$$V$$', the de-Broglie wavelength associated with it is '$$4 \lambda$$'. When the accelerating potential is increased to $$4 \mathrm{~V}$$, its wavelength will be

A
$$\frac{\lambda}{4}$$
B
$$\frac{\lambda}{2}$$
C
$$\lambda$$
D
$$2 \lambda$$
2
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Compare the rate of loss of heat from a metal sphere at $$627^{\circ} \mathrm{C}$$ with the rate of loss of heat from the same sphere at $$327^{\circ} \mathrm{C}$$, if the temperature of the surrounding is $$27^{\circ} \mathrm{C}$$. (nearly)

A
6.2
B
5.3
C
4.8
D
7.4
3
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In Balmer series, wavelength of the $$2^{\text {nd }}$$ line is '$$\lambda_1$$' and for Paschen series, wavelength of the $$1^{\text {st }}$$ line is '$$\lambda_2$$', then the ratio '$$\lambda_1$$' to '$$\lambda_2$$' is

A
$$5: 128$$
B
$$5: 81$$
C
$$7: 27$$
D
$$9: 132$$
4
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A coil of '$$n$$' turns and radius '$$R$$' carries a current '$$I$$'. It is unwound and rewound again to make another coil of radius $$\left(\frac{\mathrm{R}}{3}\right)$$, current remaining the same. The ratio of magnetic moment of the new coil to that of original coil is

A
$$3: 1$$
B
$$1: 3$$
C
$$9: 1$$
D
$$1: 9$$
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