MHT CET 2021 23th September Morning Shift | MHT CET Year Wise Previous Years Questions

Two rods of different metals have coefficients of linear expansion '$$\alpha_1$$' and '$$\alpha_2$$' respectvely. Their respective lengths are '$$\mathrm{L}_1$$' and '$$\mathrm{L}_2$$'. At all temperatures ($$\mathrm{L}_2-\mathrm{L}_1$$) is same. The correct relation is

$$\mathrm{L}_1 \alpha_1^2=\mathrm{L}_2 \alpha_2^2$$

$$\mathrm{L}_1^2 \alpha_1^2=\mathrm{L}_2^2 \alpha_2^2$$

$$\mathrm{L}_1 \alpha_2=\mathrm{L}_2 \alpha_1$$

$$\mathrm{L}_1 \alpha_1=\mathrm{L}_2 \alpha_2$$

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

The temperature of a black body is increased by $$50 \%$$, then the percentage increase in the rate of radiation by the body is approximated

50%

100%

400%

150%

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

A particle excuting S.H.M starts from the mean position. Its amplitude is 'A' and time period '$$\mathrm{T}$$' At what displacement its speed is one-fourth of the maximum speed?

$$\frac{\mathrm{A}}{\sqrt{15}}$$

$$\frac{\mathrm{A}}{4}$$

$$\frac{4 \mathrm{~A}}{15}$$

$$\frac{\mathrm{A} \sqrt{15}}{40}$$

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