HPSC PGT Physics Mock Test - 8 - HPSC TGT/PGT MCQ

The correct answer is Ethanol + Methanol​.

• Ethanol + Methanol​ is denatured alcohol.
• Denatured alcohol is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption.
• The term denatured alcohol refers to alcohol products adulterated with toxic and/or bad tasting additives (e.g., methanol, benzene, pyridine, castor oil, gasoline, isopropyl alcohol, and acetone), making it unsuitable for human consumption.
• The most common additive used is methanol (5–10%), giving rise to the term methylated spirits. Denatured alcohol is used as a lower-cost solvent or fuel for home-scale or industrial use.

Key Points

• Denatured alcohol is ethanol or grain alcohol that contains additional chemicals called denaturants that make it unfit for human consumption.
• Denatured alcohol is fine for some types of lab work and as an ingredient in certain products, but it's not safe to drink.
• Ethanol is an organic chemical compound. It is simple alcohol with the chemical formula C₂H₆O.
• Its formula can be also written as CH₃−CH₂−OH or C₂H₅OH and is often abbreviated as EtOH.

Additional Information

• Alcohol (ethanol or ethyl alcohol) is the ingredient found in beer, wine, and spirits that causes drunkenness.
• Alcohol is formed when yeast ferments (breaks down without oxygen) the sugars in different food. 

The correct answer is Haryana.

Key Points

• The Haryana government has appointed international wrestler Babita Phogat and Kabaddi player Kavita Devi as deputy directors in its Sports and Youth Affairs Department.
• They were appointed under the Haryana Outstanding Sportspersons (Recruitment and Conditions of Service) rules, 2018.
• As per the orders, both have to join the department within a month.

Additional Information

• Haryana:
  • Lok Sabha seats - 10.
  • Rajya Sabha seats - 5.
  • National Parks - Kalesar National Park, Sultanpur National Park.
  • Dams - Kaushalya Dam (Yamuna River), Ottu barrage (Ghaggar River), Anagpur Dam (Hakra River).

The logic followed here is:

1) Intact and Unflawed are synonyms meaning not damaged and perfect.

2) Entire and Partial are antonyms.

3) Bright and Luminous are synonyms.

4) Pure and Perfect are synonyms.

Both the words are synonyms in all the options except option 2, where the given words are antonyms.

Hence, the correct answer is "Entire : Partial".

The pattern followed is:

Top right number = multiplication of top left number and bottom number 

In fig 1:

729 = 81 × 9

729 = 729

In fig 2:

512 = 64 × 8

512 = 512

Similarly,

In fig 3:

? = 49 × 7

? = 343 

Hence, the correct answer is "343".

Kinesthetic/tactile persons learn best through a hands-on approach, actively exploring the physical world around them. Thus, using the hands-on approach may not help Sita much.

Learning disability is a neurological disorder that impairs the ability to receive and process information. Today, more than ever, the need for instructors who are both capable and knowledgeable about teaching children with disabilities is critical.

The shape of the wave front in case of a light diverging from a point source is spherical and is shown in the given figure. The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.

The force acting on this line is proportional to the length of this line. If l is the length of imaginary line and F the total force on either side of the line then,
F∝l
⇒ F=Sl
Or, surface tension, S=force/length
From this expression, Surface tension can be defined as the force acting per unit length of an imaginary line drawn on the liquid surface, the direction of force being perpendicular to this line and tangential to the liquid surface.it is denoted by S and it is a scalar quantity. 

Correct Answer :- C

Explanation : Magnetic Moment = Magnetization × Volume

Side of cube = 20 cm

= 0.2 m

= 500 × 0.2 × 0.2 × 0.2

= 4Am²

The magnetic field is

= 5 × 10^–6 T

According to right hand palm rule, the magnetic field is directed  towards south.

When the charge is given to inner cylinder than there is an electric field is produced between cylinders which is given by
and due to this a potential difference is developed between two cylinders.

Frequency=C/ λ
λ=h/P
frequency=C P/ h
f=(3×10⁸×3.3×10^-29)/6.6×10^-34
f=3× 10¹³/2
f=1.5×10¹³ Hz

The work done by a conservative force is equal to zero when the force is applied perpendicular to the displacement. In this case, the force acts against the direction of motion, resulting in negative work done. As conservative forces are path-independent, the negative work done cancels out the positive work done in other parts of the path, resulting in a net work of zero.

Weight of the block is 20N thus maximum friction that can act is 0.4 x 20 = 8N
But as the external force acting, F = 2.8N < 8N,
We get f = F = 2.8N

The ball is at rest, it has maximum potential energy. When the ball is released from rest with the spring at its normal (unstretched) length it loses some potential energy and energy of spring increases. Hence, loss in potential energy of the ball is equal to gain in potential energy of spring.
∴mgx=1/2​kx²
∴x=2mg/k​
Also, for x′=x/2​,
kx′=mg i.e. forces are equal thus, the ball will have no acceleration at the position where it has descended through 2x​.
And when ball is at lowermost position, the spring force will be
kx=2mg
Hence, the ball will have an upward acceleration equal to g at its lowermost position.

We know that PV=nRT also PM=dRT
So in the equation The value of R depends on P , V , n , T , d , M
except atomicity 
 so the ans is A

Spin and Orbital angular momentum arise due to the presence of unpaired electrons. If there are unpaired electrons, these momenta will be there otherwise not.

When a parametric material comes close to a magnetic field the atoms will align with the magnetic field which causes another magnetic field. Permeability is the total magnetic field divided by the original magnetic field. Increase in temperature makes it harder for the atoms to align which decreases the strength of the second field. This results in a lower total magnetic field (numerator) and thus lower permeability.

Between two square faces the area is 0.01×0.01=1×10⁻⁴m² and length is 0.5m. So, the resistance is (3.5×10⁻⁵×0.5)/(1×10^-4)=0.175ohm, this can be written as, (35/2) x10^-2 ohm
Between the rectangular face the area is 0.01×0.5=0.005m² and the length is 0.01m, hence the resistance is (3.5×10⁻⁵×0.01)/0.005=7×10^-5 ohm

[E] = [F][d]
= [P/T][A]^½ 
[E] = P¹A^½T^-1

Angular momentum is conserved.
I1w1 = I2w2
I2 = (2/5)I1
I1(40) = (2/5)I1w2
w2 = 100 rpm

Since the charges are unlike, the force will be attractive. Thus the force directs from 1C to -4C.

For var ious combination s equivalent r esistan ce is maximum between P and Q.

Instantaneous current i=2sin(100πt+π/3)A
At (t=0),  i(0)=2sin(π/3)=2×√3/2​​=√3​A
The current at the beginning will be √3​ A
 

We know that retardation of a car with an initial speed of 50kmph stops after 6 m.
We know that v² - u² = 2as  (third equation of motion)
► 0 - 50² = 2 * a * 6
► a = - 50² / 12
Hence when the initial speed is 100 kmph
We get,
► -100² = 2 * a * s
► 2 * s = 12 * (100² / 50²)
Thus we get s = 24 m.

This can be verified graphically

ObtaIning instantaneous acceleration from graph

Magnification in microscope is  m=− lD/f₀​​f_e
where, l is length of tube and D is least distance for clear vision
f_0​ is focal length of objective
fe​ is the focal length of the eyepiece.
So, as l increases m increases.
Hence, the magnifying power of a microscope increases with increase in tube length.
 

Natural frequency of the circuit, f = 1/2π√(LC)
here, L = 20mH = 20 × 10^-3 H, C = 50μF = 50 × 10^-6 C
so, f = 1/2π√(20 × 10^-3 × 50 × 10^-6)
= 1/2π√(1000 × 10^-9)
= 1/2π√(10^-6)
= 1000/2π = 500/π Hz ≈ 159 Hz

Angular acceleration is defined as the rate at which an object's angular velocity changes over time. It is given by the formula:
Angular acceleration (α) = Change in angular velocity (Δω) / Change in time (Δt)