AWES TGT Physics Mock Test - 4 - AWES TGT/PGT MCQ

IIT Bombay is ranked 45th globally in engineering according to the QS World University Rankings 2024, highlighting its excellence in the field and its leading position in South Asia.

The correct answer is 1895.

Key Points

• The Natal Indian Congress was an organization that aimed to fight discrimination against Indians in South Africa.
• The Natal Indian Congress was founded by Mahatma Gandhi along with other Indians in 1895.
• Gandhi was the Honorary Secretary and Abdoola Hajee Adam Jhaveri (Dada Abdulla) was elected president.
• The Natal Congress in its early stages focused on providing equality to all races and people of all castes, genders, and Creeds.
• From the 1920s the organization functioned under the umbrella organization, the SAIC (South African Indian Congress).
• However, in the 1930s-1940s, the NIC experienced more radical leadership when Dr. G.M. Naicker emerged on the scene 

Nalin Negi has been appointed as the Chief Executive Officer of BharatPe after serving as the interim CEO and CFO. Under his leadership, the company has seen significant revenue growth and achieved positive Ebitda, showcasing his experience and strategic capabilities in the fintech and banking sectors.

India accounted for the highest number of tuberculosis (TB) cases in the world in 2022, representing a staggering 27 percent of the global burden, as revealed by the new World Health Organization (WHO) 2023 Global TB report released.
According to the report, India recorded 2.8 million (28.2 lakh) TB cases in 2022, with a case fatality ratio of 12 per cent.  Featuring data from 192 countries and areas, the report reveals that 7.5 million people were diagnosed with TB in 2022.

Dispersive power depends on the material of the prism. When light transitions from one medium to another it bends on the basis of the refractive indices of the two media. Dispersive power is a measure of the amount of difference in the refraction of the highest and lowest wavelengths which enter the prism.

Dimensional Analysis (also called Factor-Label Method or the Unit Factor Method) is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value. It is a useful technique.

Another use of dimensional analysis is in checking the correctness of an equation which you have derived after some algebraic manipulation. Even a minor error in algebra can be detected because it will often result in an equation which is dimensionally incorrect.

Clearly, the force is time-dependent.  

The frequency of radiation arising from the two close energy levels in hydrogen known as Lamb shift i.e. 1057 MHz is radio waves as it belongs to the short wavelength end of the electromagnetic spectrum. this wavelength correspond to microwave region of electromagnetic waves.

Using the relation

Initial unpolarized intensity is 2a² 
the intensity of light transmitted by the first polarizered will be I_unpolarized/2​​=a²
option A is correct

Given that 90% is left un-decayed after time 't'.
Hence, 10% decays in time 't'.
Initially assume that the amount of substance is 'x'
After time 't' 10% is decayed.
i.e. Amount of substance left =0.9x
After further time 't' another 10% is decayed.
i.e. 0.1×0.9x is decayed 
Leaving behind 0.81x.
Hence after time 2t we see that 0.19x has decayed, which is 19%.
 

Natural Frequency of an LC Oscillator

- The natural frequency of an LC oscillator is determined by the values of the inductance (L) and capacitance (C) in the circuit.

- The LC oscillator is a type of oscillator circuit that uses a combination of inductors and capacitors to generate oscillations at a specific frequency.

- The natural frequency of an LC oscillator can be calculated using the formula:

f = 1 / (2 * π * √(LC))
 

A freely falling body observes a constant downwards force of gravity which hence applies a constant downward acceleration upon the body.

The final image of the moon should be formed at a distance of 100 cm. Using a concave lens of focal length 100 cm will enable him  to see the moon distinctly.

Focal length of lens =-100 cm

CONCEPT:

• Conservative force: A force is conservative if the work done by the force in displacing an object from one point to another point is independent of the path followed by the object and depends only on the endpoints.
• Electrostatic forces, gravitational forces, elastic forces, magnetic forces, etc and are examples of conservative forces.

• Non-conservative forces: A force is said to be non-conservative if work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions.
• Examples:  Frictional force, Viscous force, Airdrag, etc.

EXPLANATION:

• Suppose a particle starts at A and a force F_ext is acting on it. The particle is moved around the loop using the same force, F_ext
• Suppose the particle eventually ends up at A itself then the entire displacement of the particle is zero which means the total work done is zero.
• A total work of one zero means there is no expenditure of energy which means the total energy is conserved. Hence statement p is correct
• The total displacement of a particle in a closed loop is zero, which means the total work done is zero. Hence statement q is correct.
• The total mechanical energy of a system is given by 

⇒ Total energy = Potential Energy + Kinetic energy

• From the statement p, it is clear that if the total work done is zero it means the energy is conserved.
• Which means Gain in kinetic energy = Loss in Potential Energy. Hence option r is correct.

Apparent weight of ball w' = w -R

R = ma (acting upward)

w' = mg-ma = m(g-a)

Hence, apparent acceleration in the lift is g-a.
Now, if the man is standing stationary on the ground, then the apparent acceleration of the falling ball is g.

Bohr never assumed stable electron orbits with the electronic angular momentum quantized as l=mvr=(nh/2π)​ Quantization of angular momentum means that the radius of the orbit and the energy will be quantized as well. Bohr assumed that the discrete lines seen in the spectrum of the hydrogen atom were due to transitions of an electron from one allowed orbit/energy to another.

In hooke's law, the constant of proportionality defines  the modulus of elasticity which is also defined as the ratio of internal reforming force / external deforming force.

g = GM​/R² 
g at height h
g_h​ = GM/(R+H)²
h = R/2
g_h ​= GM/(R + R/2​)² ​= GM/((9/4) (R²)) ​= 4/9g
Decrease in the value of g
g − 4/9g = 5/9 g

By definition of Electric Field,

We know that dq = dU + dW
And as dU =  60 and dq = 140J
We get dW = 140 - 60 = 80J

When a liquid surface meets a solid surface the angle (φ) between the two surfaces is important. In fact a surface will be wetted by water if the angle of contact is less than 90^o, and so waterproofing is designed to produce an angle of contact that is greater than 90^o.

Critical angle will be, sin⁻¹(1/1.5) = 41.8. The angle of incidence inside the prism will be 45. Since it is more than critical angle, the light ray will be internally reflected.

Explanation:

Speed of the man, v_m = 4 km/h
Width of the river = 1 km

Explanation:The induced EMF is expected to be constant in the case of a rectangular loop. In case of a circular loop, the rate of change of area of the loop during the passage out of the field region is not constant, whereas it is constant for rectangular loop.

A diode as a rectifier is used for converting AC to DC.
Following are the applications of the diode as a rectifier:
It is used for the mixing of signals.
It is used for the detection of signals.
Used in lighting systems.
When a diode is used as a rectifier, it acts as a two-lead semiconductor which allows current to pass from only one direction.

Power=IV
Where I=V_rms value of current=I_V
And V=V_rms value of voltage=E_V
Therefore, P=E_VI_V