NVS PGT Physics Mock Test - 3 - NVS 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 Nitrification.

Key Points

• The process of conversion of ammonia into nitrate nitrogen is called nitrification.
• It is done in two steps- Nitrite formation, Nitrate formation.
• Nitrite formation- Ammonia are oxidized to nitrites by Nitrococcus, Nitrosomonas.

Additional Information

• The nitrogen cycle has four steps-
  • Nitrogen Fixation- Conversion of molecular nitrogen into the inorganic nitrogenous compound.
  • Ammonification- Conversion of the dead organic nitrogenous compound into ammonia.
  • Nitrification- Oxidation of ammonia into nitrates.
  • Denitrification- Nitrites or nitrates converts back into molecular nitrogen.

P, Q, R, S, T, V, W, and Z are sitting around a circle facing at the centre not necessarily in this same order.

i) T is second to the right of R who is third to the right of P.

Mistake Points

Who is used for the second person in a connecting statement.

For example: 

T is second to the right of R who is third to the right of P.

Here, who is used for R and not for T.

ii) S is second to the left of P and fourth to the right of Q.

iii) V who is not an immediate neighbour of P. (This means V cannot sit immediate left or right of P).

iv) Z is third to the right of V 

Thus we can see R is second to the right of W

Hence, the correct answer is "Option 1".

The logic followed here is:

• In each figure A, B, and C, the image is divided into two equal parts and one of the parts is shaded whereas, in figure D more than half of the figure is shaded. 

Hence, figure D is the odd one out of the given figures. 

Primary level students learn more by observing pictures and specimens. Thus, they are most effective in teaching primary level students. Pictures and specimens are important visual tools which facilitate learning.

Reflexive teaching helps the teacher to self-evaluate his/her own teaching abilities. This involves the participation of both the teacher and the students. It tells the teacher about the actions that he/she takes in the classroom and the reasons behind it. The main concept is to collect and analyse both classroom and teaching data, and evaluate methodologies to achieve the goals of teaching.

By Faraday's Law of induction,
ε=− dϕ​/dt
=−Bl (dx/dt) ​=−Blv_0​
This emf should induce the movement of charges creating a current. But due to the attached capacitor, all charges are conserved.
Thus I= dq/dt ​=0
The correct option is C.

The impending motion refers to the state of a body when it is on the verge of slipping. In such cases, the static friction has reached its upper limit and is given by the equation, F=μ_sN

Cathode rays are high energetic electron beam.
Specific charge of cathode rays = e​/m_e​
Specific charge of positive rays =∣e∣/m​
Since the mass of positive rays is much larger than that of cathode rays, so the specific charge for positive rays is much smaller than that for cathode rays.

On performing integration:

P=P1​+P2​=+2−1=+1 dioptre, lens behaves as convergent
F=1​/P=1/1​=1m=100cm

The body is in circular planetary motion this implies that Potential energy will be negative (attractive)  and the total energy of the system will lie between zero and potential energy (because of circular motion).

Electric flux emerging from the cube does not depend on size of cube.

Infrared waves are emitted by hot bodies. They are produced due to the de-excitation of atoms.
They are called Heat waves as they produce heat falling on matter. This is because water molecules present in most materials readily absorb infrared waves. After absorption, their thermal motion increases, that is, they heat up and heat their surroundings.
Uses: Infra red lamps; play an important role in maintaining warmth through greenhouse effect.

Dipole is defined as two equal but opposite charges, kept at a small distance and having a dipole moment. The dipole moment is simply the product of the electric charge and length of the dipole. The dielectric constant of the medium doesn’t affect the dipole moment i.e. dipole moment of an electric dipole will be the same in water as well as in the air.

Let, the length of wire = l unit

Fraction required =a

Then, the lenght of wire which is stretched =al

Work done = potential*charge by definition. We know that the potential of a point is the amount of work done to bring a unit charge from infinity to a certain point. Therefore, work done W=q*V=4*10^-3*200J=0.8J. The work done is positive in this case.

Heat extracted from source Q1= 700 cal
Heat rejected to the sink Q2= 500 cal
Temperature of source T1= 150 +273= 423K
Temperature of sink T2 to be found:
 Q2/Q1 = T2/T1
So,
T2 = (Q2/Q1) x T1
= (500 x 423)/700
= 302.02 K
= 29.02 degree C.
 

In the case of a non-conducting sphere, an electric charge is uniformly distributed throughout the sphere. Inside the sphere, the electric field at a point will be only due to the electric charge inside that point. There will be no effect of the remaining charge outside that point. In the case of the conducting sphere, the electric field at every point inside the sphere is zero.

Children think that everything around them, including toys, is alive. This example points to a prominent characteristic of the preoperational stage called ‘animism’ by Piaget. It is a result of egocentric thinking and refers to the tendency of children to assign humanistic qualities to inanimate things.

• They believe that non-living things have desires and think, feel, and act like them.
• A logical consequence of animistic thinking is the strong emotional response towards non-living objects―talking to their toys, taking care of them, and expressing their feelings towards them. 

The response of a young child on the basis of the past situation is related to the 'Law of Analogy' of learning. 
The 'Law of Analogy' principle was developed by Edward Thorndike. According to him, an individual makes use of old experiences while learning a new situation. The way young child did he identified the similarities between the past situation and the present one.
Hence, the correct answer is, 'Law of Analogy' of learning.

The sounds th, ph, ch are phonemes. The phoneme is the unit of sound.  A phoneme combines with other phonemes to give rise to meaningful words. Phonemes distinguish one word from another. These are established by the use of minimal pairs, such as pat vs bat or tap vs tab.
Hence, the correct answer is, 'Phonemes.'

'A strenuous situation' is one which is difficult and requires a lot of hard work to be completed or tackled. 
Thus, option 3 is the correct answer. 
Example- A lot of strenuous work was required to drill the tunnel across the Ladakh valley.

The sentence indicates the contraction of skeletal muscles. Rhythmic contraction would mean a strong, regular pattern of movement or sound, while nonmetrical, arrhythmic, and unrhythmic mean the opposite.
In the above sentence, Rhythmic contraction suits the meaning of the sentence. Thus, option 4 is the correct answer.

The correct word is 'who' which is a pronoun used to introduce a clause giving further information about a person or people previously mentioned.

'Spellbinding' is 'something that takes a person by complete surprise as if he/she has been under the influence of magic'.
The meanings of the other words are:
Amusing: causing laughter and providing entertainment.
Tantalising: tease someone with the sight or promise of something that is unobtainable.
Tormenting: inflicting severe physical or mental suffering.
No other option has the same meaning as spellbinding. Thus option 4 is the correct answer.
Example-The beauty of the Himalayan ranges spellbound all people.

सज्जन- के लिए सही संधि विच्छेद: सत्+जन

• सज्जन का संधि विच्छेद = सत् + जन, जिन व्यंजनों में परिवर्तन के कारण संधि है = त्/द् + ज = ज्ज
• सज्जन - सत् + जन

Key Pointsयदि दन्त्य स् या त् वर्ग से पहले या बाद में तालव्य ‘श’ या च वर्ग का कोई एक वर्ण आये तो दन्त्य ‘स’ का तालव्य ‘श’ में और त् वर्ग को च् वर्ग में बदल देते हैं।

• व्यंजन संधि के उदाहरण :-
  • सत् + जन = सज्जन
  • जगत् + जननी = जगज्जननी
  • उद् + ज्वल = उज्जवल

Additional Information

सही उत्तर धर्मार्थ है।

Key Points

• धर्म + अर्थ= धर्मार्थ
• नियम- अ + अ= आ
• धर्मार्थ में "दीर्घ स्वर संधि" है।
• धर्मार्थ शब्द का अर्थ- धर्म हेतु किया गया।
• उदाहरण- सेठजी कोई भी काम धर्मार्थ करते हैं।

Additional Informationसंधि - दो शब्दों के मेल से जो विकार (परिवर्तन) होता है उसे संधि कहतेहैं।
संधि के तीन प्रकार हैं - 1. स्वर, 2. व्यंजन और 3. विसर्ग