1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Light of wavelength $$\lambda$$ strikes a photoelectric surface and electrons are ejected with kinetic energy $$K$$. If $$K$$ is to be increased to exactly twice its original value, the wavelength must be changed to $$\lambda^{\prime}$$, such that

A
$$\lambda^{\prime}<\lambda / 2$$
B
$$\lambda^{\prime}>\lambda / 2$$
C
$$\lambda>\lambda^{\prime}>\frac{\lambda}{2}$$
D
$$\lambda^{\prime}=\frac{\lambda}{2}$$
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

When in $$p$$-$$n$$ junction diode, $$p$$ is connected to the positive terminal and $$n$$ is connected to the negative terminal, then it is

A
forward bias
B
reverse bias
C
Both (a) and (b)
D
Neither (a) nor (b)
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

If an object of height $$6 \mathrm{~cm}$$ is viewed through a liquid of refractive index $$\frac{4}{3}$$ vertically at a depth of $$10 \mathrm{~cm}$$. Then what will be its apparent height and apparent distance from the surface of liquid.

A
Same height, $$7.5 \mathrm{~cm}$$
B
$$2.5 \mathrm{~cm}, 4 \mathrm{~cm}$$
C
$$2.5 \mathrm{~cm}, 8 \mathrm{~cm}$$
D
$$8 \mathrm{~cm}, 18 \mathrm{~cm}$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

The half-life period of a radioactive element $$x$$ is same as the mean life time of another radioactive element $$y$$. Initially, both of them have the same number of atoms. Then,

A
$$x$$ and $$y$$ have the same decay rate initially
B
$$x$$ and $$y$$ decay at the same rate always
C
$$y$$ will decay at a faster rate than $$x$$
D
$$x$$ will decay at a faster rate than $$y$$
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