- A$\frac{1}{\text{r}}$
- B$\frac{1}{\text{r}^2}$
- C$\text{r}$
- D$\text{r}^2$
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Assertion : X-rays can penetrate through the flesh but not through the bones.
Reason : The penetrating power of X-rays depends on voltage.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than
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(a) 30o |
(b) 60 o |
(c) 45 o |
(d) 90 o |
Assertion : A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium.
Reason : A narrow pulse is made of harmonic waves with a large range of wavelengths.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
The value of plate current in the given circuit diagram will be
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(a) 3 mA |
(b) 8 mA |
(c) 13 mA |
(d) 18 mA |
When objects at different distances are seen by the eye, which of the following remain constant?
What is the modulation index of an over modulated wave
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(a) 1 |
(b) Zero |
(c) < 1 |
(d) > 1 |
A boy stands straight infront of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is of his real height. The mirror he is using is
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(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) Plano-convex mirror |