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 The Commission for Agricultural Costs and Prices.

• Based on the recommendations of the Commission for Agricultural Costs and Prices, the Department of Agriculture and Co-operation, Government of India, declares Minimum Support Prices (MSP) for 22 crops before their sowing seasons.

Key Points

• The CACP is an attached office of the Ministry of Agriculture and Farmers Welfare, formed in 1965.
• It is a statutory body that offers separate reports recommending prices for Kharif and Rabi seasons.

Additional Information

• Cost of farming at three levels:
  • A2: All the types of cash expenditure to create the crop like seeds, manure, chemicals, labour costs, fuel costs and irrigation costs.
  • A2+FL: It includes A2 plus an imputed value of unpaid family labour.
  • C2: Under C2, the estimated land rent and the cost of interest on the money taken for farming are added to A2 and FL.
• On 18^th November 2004, the Union government formed the National Commission on Farmers (NCF) with MS Swaminathan as its chairman.
• The main purpose of the committee was to come up with a sustainable farming system, make farm commodities cost-competitive and more profitable.

‘Knife’ is related to ‘Cut’, means we use knife for cutting.

Similarly,

We use pen for writing.

Hence, Write is the correct answer.

The total distance = 15 + 20 + 30 + 15 = 80m

Hence, the correct answer is 80m.

Theory of multiple intelligence was given by Howard Gardner and he proposed eight different intelligences to determine human potential.

Definition based

According to the law of reflection, the angle of incidence and angle of reflection are equal. Both these angles are measured with respect to a line normal to the reflection surface. If I understand the question correctly, the incident ray makes an angle of 60 degrees with the mirror surface, then the angle of incidence can be calculated as:

Angle of incidence = 90 - angle made with the mirror surface

= 90 - 60 = 30 degrees.

Since, angle of incidence = angle of reflection = 30 degrees.

The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface).

The reflected ray will make an angle of 60 degrees (90 - 30 degrees) with the mirror surface.

• 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:

The necessary condition for phenomenon of interference to occur are:
1. There should be two coherent sources.
2. The frequency and amplitude of both the waves should be same.
3. The propagation of waves should be simultaneously and in same direction.
These are the conditions, no explanation.

The Critical Angle
a light ray is in the more dense medium and approaching the less dense medium.
The angle of incidence for the light ray is greater than the so-called critical angle.
When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur. For any angle of incidence greater than the critical angle, light will undergo total internal reflection.

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.

We know that,
MOI through centre (z-axis) is MR², so, by applying perpendicular axis theorem
Ix + Iy = Iz and since Ix = Iy and both are about diameter
Iz = MR², so, 2Ix = MR² MOI about diameter is MR²/2
 

Given,
Capacitance, C=100μF=100x10^-6F
10^-4F
Resistance, R=40Ω
Rms voltage, E_v=110 volt
Peak voltage, E₀=√2 .E_v=√2 x 110V
Frequency of Ac supply, v=60Hz.,
ω=2πv=120π rad/s
peak current, I₀=?
a.   In RC,as
Z=√(R²+X_C²)= √[R²+(1/ ω²C²)]
Therefore,
I₀=E₀/√[R²+(1/ ω²C²)]
  =√2x100/√[1600+(1/120πx10^-4)²]
I₀=3.23amp
b.   In RC circuit voltage lags behind the current by phase angle Φ, where Φ is given by,
tanΦ=(1/ω)/R
=1/ωCR
=1/(120πx10-4x40)
=0.6628
⇒ Φ=tan^-1(0.6628) =33.5o
=(33.5π/180)rad
Time lag= Φ/ω
=33.5π/180x120π
=1.55x10^-3 sec.
=1.55ms
 

In this process, heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer

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

KEY CONCEPT :

∆ U = ∆ Q - ∆ W
In an adiabatic process ∆Q is zero, therefore
∆ U = - ∆ W

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

On equatorial line, the direction of electric field is reversed to that of angle of axial line. Therefore, the angle between dipole moment and electric field is 180°.

The number of images between two plane mirror inclined at an angle θ when the object is placed symmetrically between the mirrors is given as
n=(360o​/ θ) −1
Given, 
θ=60o
∴n=(360^o​/60)−1=6−1=5

For the right (half) oscillation,

For the left (half) oscillation,

Drift speed and current density are inversely proportional to the area of cross-section of a wire. Thus, they are dependent on the cross-section. The charge crossing in a given time interval is independent of the area of cross-section of the wire. Free electron density is the total number of free electrons per unit volume of the wire. The density of free electrons depends on the distribution of the free electrons throughout the volume of the wire. It does not depend on the cross-section of the wire.

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.

Let particle (1) is moving towards right and particle (2) is moving towards left art this instant, 1 = 0 

Width of the magnetic field region where 'R' is its radius of curvature inside magnetic field,

Currents are in the same direction, so at the middle B=D
And the B varies exponentially not linearly,
So,