Summary

Q. What will be the projection of vector $\overrightarrow{A}=\hat{i}+\hat{j}+\hat{k}$ on vector $\overrightarrow{B}=\hat{i}+\hat{j}?$

1. $\sqrt{2}(\hat{i}+\hat{j}+\hat{k})$
2. $\sqrt{2}(\hat{i}+\hat{j})$
3. $(\hat{i}+\hat{j})$
4. $2(\hat{i}+\hat{j}+\hat{k})$

Q.

What is the difference between polarized light and unpolarized light?

Q. The resultant of two vectors $\overrightarrow{P}$ and $\overrightarrow{Q}$ is $\overrightarrow{R}$. If $Q$ is doubled, the new resultant is perpendicular to $\overrightarrow{P}$. Then $R$ equals to

1. $P$
2. $(P+Q)$
3. $Q$
4. $(P-Q)$

Q.

What are the two types of interference?

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. 2.0 micro-coulomb
2. 0.5 micro-coulomb
3. 1.0 micro-coulomb
4. 2.5 micro-coulomb

Q.

A police jeep is chasing a culprit going on a motorbike. The motorbike crosses a turning at a speed of 72 km/h, The jeep follows it at a speed of 90 km/h, crossing the turning ten seconds later than the bike. Assuming that they travel at constant speeds, how for from the turning will the jeep catch up with the bike?

Q. Two vectors, both equal in magnitude, have their resultant equal in magnitude to any of the two vectors. Find the angle between the vectors.

1. ${60}^{\circ }$
2. ${75}^{\circ }$
3. ${90}^{\circ }$
4. ${120}^{\circ }$

Q. Assertion : Photoelectric effect demonstrates the wave nature of light.

Reason : The number of photoelectrons is directly proportional to the frequency of light.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.

2. Both assertion and reason are true but reason is not the correct explanation of the assertion.

3. Assertion is true but reason is false.

4. Assertion and reason both are false.

5. Assertion is false but reason is true.

Q.

In an experiment for determination of refractive index of glass of a prism by i - $\delta$ plot, it was found that a ray incident at angle ${35}^{\circ }$, suffers a deviation of ${40}^{\circ }$ and that it emerges at angle ${79}^{\circ }$. In that case which of the following is closest to the maximum possible value of the refractive index?

1. 1.8

2. 1.5

3. 1.7

4. 1.6

Q.

What are the different types of polarization?

Q.

A glass prism with the refracting angle of $60°$and refractive index of $1.5$ is completely immersed in water with a refractive index $1.33$. Calculate the angle of minimum deviation of the prism in this situation, ${\sin }^{-1}\left(0.56\right)=34.3°$.

Q.

What is the principle of reversibility?

Q. 26.The time of vibration of a dip needle vibration in the vertical plane in the magnetic meridian is 3 sec.When the same magnetic needle is made to vibrate in the horizontal plane, the time of vibration is 3sqrt2 sec.Then the angle of dip will be a)90 degree b)60 degree c)45 degree d)30 degree

Q. A black spot on the surface of a glass sphere of refractive index new equals to 3/2 is view from Dialectical opposite position it appears to be a distance of 10 cm from spot diameter of sphere is.

Q.

What is Polarization?

Q. The direction of three forces 1 N, 2 N and 3 N acting at a point are parallel to the sides of an equilateral triangle taken in order. The magnitude of their resultant in newton upto 2 decimal places is

Q.

Unpolarized light of intensity $I$ passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be $\frac{I}{2}$. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be $\frac{I}{8}$. The angle between polarizer A and C is:

1. $45°$

2. $60°$

3. $0°$

4. $30°$

Q.

Polaroid glass is used in sunglasses because

1. It reduces the light intensity to half on account of polarization

2. It is fashionable

3. It has good color

4. It is cheaper

Q.

The Newtons laws of motion are valid in

1. Inertial frames

2. Non-inertial frames

3. Rotating frames

4. Accelerated frames

Q.

A particle $P$ is sliding down a frictionless hemispherical bowl. It passes the point $A$ at $t=0$. At this instant of time, the horizontal component of its velocity is $v$. A bead $Q$ of the same mass as $P$ is ejected from $A$ at $t=0$ along the horizontal string $AB$, with the speed $v$. Friction between the bead and the string may be neglected. Let $t_P$ and $t_Q$ be the respective times taken by $P$ and $Q$ to reach the point $B$. Then:

1. $t_P<t_Q$

2. $t_P=t_Q$

3. $t_P>t_Q$

4. $\frac{t_P}{t_Q}=\frac{\text{length of arc ACB}}{\text{length of AB}}$

Q. A car leaves station $X$ for station $Y$ every $10\text{min}$. The distance between $X$ and $Y$ is $60\text{km}$. The car travels at speed $60\text{km/h}$. A man drives a car from $Y$ towards $X$ at speed $60\text{km/h}$. If he starts at the moment when first car leaves station $X$, how many cars would he meet on route?

1. $7$
2. $20$
3. $10$
4. $5$

Q.

Do enantiomers have optical activity?

Q.

What do you mean by interference?

Q. An electric charge $+q$ moves with velocity $\overrightarrow{V}=3\hat{i}+4\hat{j}+\hat{k}$, in an electromagnetic field given by
$\overrightarrow{E}=3\hat{i}+\hat{j}+2\hat{k}\&\overrightarrow{B}=\hat{i}+\hat{j}+3\hat{k}$.
The $y-$component of the force experienced by $+q$ is :

1. $-7q$
2. $10q$
3. $-11q$
4. $-9q$

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. $\text{PR}$
4. $\text{PQ}$

Q. The rate change of displacement with time is .

1. speed
2. velocity
3. acceleration

Q.

The velocity of a projectile equals to its initial velocity added to

1. a constant horizontal velocity

2. a constant vertical velocity

3. a continuously increasing horizontal velocity

4. a continuously increasing downward velocity

Q.

What is wane front ? State its relation with ray of light .

Q. A light source $\text{S}$ (point source) is placed at the centre of a glass sphere of radius $R$ and refractive index $\mu$. The maximum angle $\theta$ with the $x-$axis (as shown in the figure) an incident light ray can make without suffering total internal reflection is

1. ${\cos }^{-1}(\frac{1}{\mu })$
2. ${\sin }^{-1}(\frac{1}{\mu })$
3. ${\tan }^{-1}(\frac{1}{\mu })$
4. there will never be total internal reflection.

Q. Consider the following statements:
$A.$ Atoms of each element emit characteristics spectrum.
$B.$ According to Bohr's Postulate, an electron in hydrogen atom, revolves in a certain stationary orbit.
$C.$ The density of nuclear matter depends on the size of the nucleus.
$D.$ A free neutron is stable but a free proton decay is possible.
$E.$ Radioactivity is an indication of the instability of nuclei.
Choose the correct answer from the options given below

1. $A,B,C,D\text{and}E$
2. $A,B\text{and}E\text{only}$
3. $B\text{and}D\text{only}$
4. $A,C\text{and}E\text{only}$