1
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The activity of a radioactive sample is measured as No counts per minute at $$t=0$$ and $$\mathrm{N}_0 / \mathrm{e}$$ counts per minute at $$t=6 \mathrm{~min}$$. The time (in minutes) at which the activity reduces to half its value is.

A
$$\left(\log _e 2\right) / 6$$
B
$$6 / \log _e 2$$
C
$$6 \log _0 2$$
D
$$6 \log _e 2$$
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

A ball is allowed to fall from a height of $$10 \mathrm{~m}$$. If there is $$30 \%$$ loss of energy due to impact, then after one impact ball will go up to.

A
10 m
B
8 m
C
4 m
D
7 m
3
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The elastic limit of $$1 \mathrm{~kg}$$ mass is $$3.5 \times 10^{10} \mathrm{~N} / \mathrm{m}^2$$. Find the maximum load that can be applied to a brass wire of a $$1 \mathrm{~mm}$$ diameter without exceeding the elastic unit.

A
$$4.12 \times 10^4 \mathrm{~N}$$
B
$$5.15 \times 10^4 \mathrm{~N}$$
C
$$0.55 \times 10^4 \mathrm{~N}$$
D
$$2.75 \times 10^4 \mathrm{~N}$$
4
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The focal length of thin convex lens for red and blue rays are $$100 \mathrm{~cm}$$ and $$98.01 \mathrm{~cm}$$, respectively. There, the dispersive power of the material of the lens is

A
0.968
B
0.98
C
0.020
D
0.325
EXAM MAP