Summary

Q.

The penetrating power of X-rays increases with the

1. Increase in its velocity

2. Increase in its frequency

3. Increase in its intensity

4. Decrease in its velocity

Q. Is the formula foraverage velocity x2-x1/t2-t1 or total displacement/total time

Q. dimensional formula of areal velocity

Q.

X-rays are not used for radar purpose because

1. They are not reflected by the target

2. They are not electromagnetic waves

3. They are completely absorbed by the air

4. They sometimes damage the target

Q.

If $\overrightarrow{A}$ + $\overrightarrow{B}$ = $\overrightarrow{C}$ and $A^2$ + $B^2$ = $C^2$ , then find the angle between $\overrightarrow{A}$ and $\overrightarrow{B}$

1. 30⁰

2. 60⁰

3. 90⁰

4. 120⁰

Q. Two wave pulses travel in opposite directions on a string and approach each other. The shape of one pulse is inverted with respect to the other.

1. The pulses will collide with each other and vanish after collision.
2. The pulses will reflect from each other, i.e., the pulse going towards right will finally move towards left and vice versa.
3. The pulses will pass through each other but their shapes will be modified.
4. The pulses will pass through each other without any change in their shapes after the overlap.

Q. If a negative charge is kept at point $\text{P}$ in the electric field of two charges then it will initially accelerate along

1. $\text{PS}$
2. $\text{PT}$
3. $\text{PQ}$
4. $\text{PR}$

Q.

The electric field due to a charge at a distance of 3 m from it is 500 N/coulomb. The magnitude of the charge is $[\frac{1}{4\pi {ϵ}_0}=9\times {10}^9\frac{N-m^2}{coulom{b}^2}]$

1. 2.5 micro-coulomb

2. 2.0 micro-coulomb

3. 1.0 micro-coulomb

4. 0.5 micro-coulomb

Q. An unpolarized ray of light is incident on a glass surface at polarising angle of ${57.5}^{\circ }$, then the angle between the incident ray and refracted ray is,

1. ${145}^{\circ }$
2. ${115}^{\circ }$
3. ${205}^{\circ }$
4. ${57.5}^{\circ }$

Q.

In radio theraphy, X-rays are used to

1. Detect bone fractures

2. Treat cancer by controlled exposure

3. Detect heart diseases

4. Detect fault in radio receiving circuits

Q.

The continuous X-rays spectrum produced by an X-ray machine at constant voltage has

1. A maximum wavelength

2. A minimum wavelength

3. A single wavelength

4. A minimum frequency

Q. what is the definition of velocity

Q. A muonic atom contains a nucleus of charge Ze and a negative muon, ${\mu }^{-}$, moving about it. The ${\mu }^{-}$ is an elementary charge with -e and a mass that is approximately 200 times as large as an electron mass.
Calculate the binding energy of a muonic atom(in eV) with $Z=1$.

Q. Frequency of a wave depends on source as well as medium.

1. False
2. True

Q. The resultant of two vectors $\overrightarrow{A}$ and $\overrightarrow{B}$ is perpendicular to $\overrightarrow{A}$. Magnitude of resultant $\overrightarrow{R}$ is equal to $\frac{\sqrt{3}}{2}$ times of the magnitude of $\overrightarrow{B}$. Find the angle between $\overrightarrow{A}$ and $\overrightarrow{B}.$

1. ${120}^{\circ }$
2. ${90}^{\circ }$
3. ${60}^{\circ }$
4. ${150}^{\circ }$

Q.

The separation between a point source of light anda screen is increased by 1.5%. The percentage change in the intensity is

Increases by 3%
Decreases by 3%
Increases by 0.75%
Decreases by 0.75%