HPSC PGT Physics Mock Test - 3 - HPSC TGT/PGT MCQ

The correct answer is Gamma Rays.

Key Points

• Gamma rays have the shortest wavelength and highest frequency (energy) in the electromagnetic spectrum.
• They are electromagnetic waves with wavelengths in the range of 10^-12m and frequencies around 10²⁰- 10²⁴ Hz.
• They have a high penetrating power.
• They are a result of decaying radioactive material and can also be found in outer space.
• They are used in medical applications for sterilisation of equipment and cancer treatment.

Additional Information

•  Other radiations in the Electromagnetic spectrum are:

The correct answer is ​Purandara Dasa.

Key Points

​Purandara Dasa

• ​​He is considered the Pitamaha of Carnatic music.
• His compositions are mainly in the Kannada language.
• He was born in 1484.
• Raga Mayamalavagowla first carnatic music was discovered by Purandara Dasa.

Additional Information

• Trippunithura Narayanaiyer Krishnan (TN Krishnan) was born on October 6, 1928, in Cochin.
• He learned music from his father and was provided with the patronage of the Royal Family of Cochin.
• He was tutored by Semmangudi Srinivasa Iyer, another prominent Carnatic Violinist.
• Awards:
  • Padma Shri (1973)
  • Sangeet Natak Academy Award (1974)
  • Padma Bhushan (1992)
  • Sangeet Kalanidhi (1980).

The correct answer is Hardeep Doon.

Key Points

• Haryana has got its first Traffic ADGP.
• IPS officer Hardeep Doon has been given the responsibility of this.

Additional Information

• On behalf of Home Minister Anil Vij, he has been asked to comprehensively improve the traffic system of the state.
• Also asked to make 15 permanent traffic rules on the lines of Delhi, for which the dateline of 31st December was fixed.
• Rajesh Jogpal -
  • He has been appointed as the standard chairman of Modern Pythian Games Haryana.
• Women's World Hockey Goalkeeper of the Year Savita Poonia has been selected.
• Santosh Yadav -
  • He was made the chief guest at the Vijayadashami festival by the RRS.​ 

The correct answer is Neeraj Chopra.

• Neeraj Chopra and Mirabai Chanu were among the notable winners of the 2022 Sportstar Aces Awards.

Key Points

• Sportstar of the year (Female)- Mirabai Chanu (Manipur).
• Club of the year award- Mumbai city FC.
• National team of the Year- Indian Men's Hockey team.
• Best state for the promotion of the year- Haryana.
• Prarathlete of the year- Avani Lekhara.

Important Points

The correct answer is Kurukshetra.

Key Points

• Surya Grahan Fair:
  • This fair is held in Kurukshetra district.
  • It is held on the day of solar eclipse (July).
  • On this day devotees gather and take a holy bath.
  • After taking a holy bath they conducted devotional acts.
  • This fair is very famous all over India and people come from all the states to attend this fair.

There are 8 triangles in the figure. By counting the individual triangles, we can see that there are 2 large triangles, 4 medium triangles, and 2 small triangles, making a total of 8 triangles.

Given:

Mohit got 30% marks and failed by 25 marks

Another student scored 38% and

He got 15 more marks than passing marks

Calculation:

According to the question

⇒ 30% + 25 = 38% – 15

⇒ (38% – 30%) = (15 + 25)

⇒ 8% = 40

⇒ 1% = 5 marks

Now,

5% = 25 marks 

Then,

The necessary pass percentage required = (30% + 5%)

⇒ 35%

∴ Required pass percentage is 35%

UNESCO is a United Nations' organization that uses education, culture and science as a medium to promote international collaboration and lead to peace and security in the world.

NEP 2020 aims to achieve a Gross Enrollment Ratio (GER) of 50% in higher education by 2035.

It should be thrown with a velocity greater than or equal to escape velocity of the planet only then it will not return to Earth
Escape Velocity = √(2GM/R) = (2GM/R)^1/2 
Hence A is the correct answer.

CONCEPT:

• Angular displacement (θ): The angular displacement of a body is the angle in degrees or radians or revolutions through which a point revolves around a point or axis.
• Angular velocity (ω): How fast the angular position or orientation of an object changes with time or How fast an object rotates or revolves relative to another point is known as angular velocity.
  • It is the rate of change of angular displacement.​
• Angular acceleration (α): The rate of change of angular velocity is known as angular acceleration.
• Angular momentum (L): The moment of momentum is known as angular momentum.

CALCULATION:

• The rate of change of angular velocity is known as angular acceleration. 

Mathematically,

α = dω/dt

• So the correct answer is option 3.

Explanation

To determine the number of significant digits in the number 8.1000, we can follow a systematic approach based on the established rules of significant figures

1Identify non-zero digits. In the number 8.1000, the digits '8' and '1' are non-zero. According to the rules of significant figures, all non-zero digits are considered significant. Therefore, we have two significant digits from these numbers

2Examine the zeros. The zeros in the number 8.1000 need to be evaluated based on their position. The first zero appears after the '1', and since it is sandwiched between non-zero digits (1 and 0), it is significant

3Analyze trailing zeros. The last three zeros in 8.1000 come after the decimal point and follow the last non-zero digit (which is '1'). According to the rules, trailing zeros in a decimal number are significant. Therefore, these three zeros also count as significant digits

4Count the total significant digits. Adding the significant digits identified: 2 (from '8' and '1') + 1 (from the zero between '1' and '0') + 3 (trailing zeros) gives us a total of 5 significant digits

Definition based

The sun heats the earth through radiation. Since there is no medium (like the gas in our atmosphere) in space, radiation is the primary way that heat travels in space. When the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.

• Eddy currents are the currents which are induced in a conductor whenever the amount of linked magnetic flux with the conductor changes.
• These were discovered by Foucault in the year 1895 and hence they are also called Foucault currents.

Eddy currents:

According to the Principle of Superposition, if the particle of a medium is given an order (i.e. of oscillating sinusoidally) and then another order (similar or different), the particle simply adds the two orders vectorially (i.e. by vector method), and then oscillates by the amplitude of the resultant vector.
So if the particle of a medium is given two similar orders (i.e., both the sine waves having the same amplitude, say A) then the particle will oscillate with an amplitude, 2A, i.e., the amplitude will be doubled.

Energy at ground state E_1​=−13.6 eV
Energy at n=3: E_3​=−13.6/9​=1.5 eV
To excite it to n=3 energy given to electron is E₃​−E₁​=12.1 eV

Significant Digits

Significant digits are the digits in a number that carry meaning contributing to its precision. They are used to indicate the reliability of a measurement.

Rules for determining significant digits:

1. Non-zero digits are always significant.
2. Zeros between non-zero digits are always significant.
3. Leading zeros (zeros to the left of the first non-zero digit) are never significant.
4. Trailing zeros in a number with a decimal point are significant.

Applying the rules to 0.000532:

• The first non-zero digit is 5.
• The digits following 5, which are 3 and 2, are non-zero and therefore significant.

So, the significant digits in 0.000532 are 5, 3, and 2.

The zeros before the 5 are leading zeros and do not contribute to the precision of the number, hence they are not significant.

The formula for calculating the escape velocity from the surface of a celestial body (e.g. a planet) is:

where G is the universal gravitation constant, M is the planet’s mass and R is its radius. Different planets have different mass and radius - and therefore different escape velocity.

Suppose M₂ moves downwards with an acceleration a and the tension in the string is T.

Average force = change in momentum/time
Change in momentum = m(v1 - v2)
=0.01[ 5 - (-5)]
=0.1
Average force = 0.1/0.01
= 10 N

Explanation:

for monoatomic gas 

from conservation of energy

Explanation:A will become positive with respect to B because current  indused is in clockwise direction

The described situation is shown in the given figure.

 Here,

v_c = Velocity of the cyclist
v_r = Velocity of falling rain

In order to protect herself from the rain, the woman must hold her umbrella in the direction of the relative velocity (v) of the rain with respect to the woman.

Hence, the woman must hold the umbrella toward the south, at an angle of nearly 18° with the vertical.

If a magnet is suspended over a container of liquid air, it attracts droplets to its poles. The droplets contain only liquid oxygen; even though nitrogen is the primary constituent of air, it is not attracted to the magnet. Explain what this tells you about the magnetic susceptibilities of oxygen and nitrogen, and explain why a magnet in ordinary, room-temperature air doesn’t attract molecules of oxygen gas to its poles.

The opposition offered by a capacitor for the flow of A.C is called capacitive reactance.
Xc = 1/wC
it's SI unit is ohm

Magnetic dip or inclination at a place is defined as the angle made by the Earth’s magnetic field with the horizontal in the magnetic meridian. It is denoted by δ.
Magnetic declination at a place is defined as the angle between the geographic meridian and magnetic meridian.

Conservation of angular momentum is a physical property of a spinning system such that its spin remains constant unless it is acted upon by an external torque; put another way, the speed of rotation is constant as long as net torque is zero.

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.

In the frame of wedge, the force diagram of block is shown in figure. From free body diagram of wedge.

For block to remain stationary

ma cos α = mg sin α

or         a = g tan α