AWES TGT Physics Mock Test - 5 - AWES TGT/PGT MCQ

The US Chamber of Commerce released the 12th edition of the International Intellectual Property (IP) Index, ranking 55 economies on their IP frameworks. India secured the 42nd position with a 38.64% overall score. The United States, the United Kingdom, and France topped the list, emphasizing the pivotal role of strong IP systems in economic development. The index evaluates the effectiveness of IP landscapes in fostering innovation and creative industries globally.

• World Book and Copyright Day is observed every year on April 23 to promote the habit of reading, writing, publishing and copyright.
• The first World Book Day was observed in 1995. International Decade of Indigenous Languages will be observed from 2022 to 32. The UNESCO theme of the World Book Day 2023 is ‘Indigenous Languages’.

Squadron Leader Dalip Singh Majithia, the oldest living pilot of the Indian Air Force (IAF), passed away at the age of 103. He joined the IAF during World War II, showcasing his bravery and commitment during a crucial period in global history, further highlighting his significant contributions to the Indian military legacy.

The polarization angle (also called Brewster's angle)is defined as the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection.
Brewster's Law states that the tangent of the angle of polarization is numerically equal to the refractive index of the medium.
μ = tan i ...................... (1)
From Snell's law:
μ = sinr sini​ ....................(2)
Comparing (1) and (2)
cos i = sin r = cos (2π​ - r)
i.e. i = (2π​ - r)
So, i + r = 2π​
So, as seen from the diagram, if i + r = 90^o Then the angle between reflected ray and refracted ray will be 180^o - 90^o = 90^o

In fibre optics ,an optical phenomenon known as total internal reflection is used to transmit light rays. In case of the simplest form of optical fiber, light entering one end of the fiber strikes the boundary of the fiber and is reflected inward.

As we know,
Average power in ac circuit is given by P=V_rms​i_rms​cosϕ 
For pure capacitive circuit ϕ=90^o so P=0

Long-sighted people who have lost their spectacles can still read a book by looking through a small (3-4 mm) hole in a sheet of paper because by doing so due to the diffraction at the hole the focal length of the eye lens is effectively decreased. Hence the correct option is C.
 

Velocity of efflux 

Find ‘h’ to have range of ejected water ≥ x x 

Since the charge –q is moving in elliptical orbit so to make its motion stable the total angular momentum of the charge is constant since it experience a centripetal force from the charge +Q so it follow the motion as the motion of earth around sun.

For the combination of lens,
Here, u = −40 cm, v = +80 cm,f = ?

⇒ f₂ = −400cm

When we use white light, the central bright will have light from all wavelengths as none of them cancel out. Hence the central bright fringe appears white.
For other bright fringes, depending on the wavelength of light constructive interference will not take place for certain wavelengths. Hence they will not be white, rather will be coloured, hence differentiated from central fringe.

Let the horizontal displacement of the plank, at an instant during its oscillation is x and its velocity is v.

Time taken by first drop to cover 5 cm (u = 0), is: 
h = 1/2 gt²
5 = 1/2 x 10 x t²
t = 1 sec
Hence, the interval is 0.5 sec for each drop.
Now distance fallen by second drop in 0.5 sec
h₁ = 1/2 gt²
= 1/2 x 10 x (0.5)²         
= 5 x 0.25 
= 1.25 m
Height above the ground ( of 2^nd drop) = 5 - 1.25 = 3.75 m

The negative sign signifies that the induced emf always opposes any change in the magnetic flux.

The direction of the induced current is as shown in the figure, according to Lenz’s law which states that the indeed current flows always in such a direction as to oppose the change which is giving rise to it.

We have, (1/v)−(1/−90)=1/f⇒(1.5−1)(1/30)=1/60
∴ v=180 cm
∴|m|=∣v/u∣=180/90=2.0

Copper is a metal whereas Germanium is Semi-conductor.
NOTE : Resistance of metal decreases and semiconductor increases with decrease in temperature.

When megnetic force balances electric force F_B = F_E
q v_d B = q _E

when d₁ = 2d₂, V₂ = 2V₁

and when d₁ = d₂, V₂ = V₁ (a), (d) are correct options

Cos Ø is called a power factor that indicates what fraction of [(Voltage V) x (Current I)] becomes the useful power. Most electric circuits have resistance and inductance. In such an electric circuit, the current lags the voltage by the phase difference.

We know that,
I=V/R​
∴​I₁/I₂ ​​= ​R₂/ R₁
​​R₁​=90Ω​
Current flowing through 90Ω resistance is reduced by 90%
∴ Current ratio =10%:90%
=1:9
∴1/9​=R₂​R₁
​​⇒1/9​= R₂​/90
​⇒R₂​=90/9​=10
∴R₂​=shunt=10Ω

Explanation:When a body is moving on a rough horizontal surface then their will be 2 forces acting on the body   1. Applied force ( in the direction of motion) 2. friction ( opposite to direction of motion)As applied force is in same direction as displacement so work done will be positive.

Let the ball is pressed down by a small y, then the value of air decreased by Ay.  

Then, excess pressure is 

Conservation of angular momentum:
L= 2m dA/dt

μ=sinisinr

Again for minimum deviation

μ=sin(A+δmin2)sinA2

∴μ=sinisinA2

⇒sinA2=siniμ

⇒sinA2=sin45∘√2=12

⇒A2=30∘

⇒A=60∘

Again i+e=A+δmin

For minimum deviation i=e

∴2i=A+δmin

⇒δmin=2i−A

⇒δmin=2×45∘−60∘=30∘

The electric and magnetic fields are Parallel and separated because magnetic field applies force only on moving charge and electric field applies force both moving and stationery charges.

Electric potential is a positive quantity if both the charges are positive. In this case, all the three charges are positive; hence there is no negative term in the total energy term. Therefore, we cannot make the total energy of the system zero by adjusting the values of charge. But it would be possible if one of the charges were positive.