NVS PGT Physics Mock Test - 1 - NVS TGT/PGT MCQ

The correct answer is All of these.

Key Points

• Jet Streams develop where air masses of differing temperatures meet.
• El Nino:
  • El Nino refers warming of sea surface temperatures across the central and east-central Equatorial Pacific.
  • El Nino is associated with high pressure in the western Pacific.
  • El Nino is the opposite of La Nina.
  • Rainfall follows the warm water eastward, with associated flooding in Peru and drought in Indonesia and Australia.
  • El Nino adversely impacts the Indian monsoons and hence, agriculture in India.
• Equatorial low-pressure belt:
  • This belt extends from the equator to 10⁰ N and 10⁰ S latitudes.
  • The intertropical convergence zone (ITCZ) is known as the region of convergence near the equator because the winds flowing from subtropical high-pressure belts converge here.
    • Water vapor condenses as air rises and cools in the ITCZ, forming clouds and falling as rain. 
  • This low-pressure belt is also known as doldrums because it is a zone of total calm without any winds.
  • Due to high temperatures, a low-pressure belt is created in the equatorial region.
  • This gives rise to air convergence in the area.
• Southwest monsoons winds:
  • India receives most of its rainfall from the southwest monsoon winds.
  • 'Southwest Monsoon' period is referred to as the period between June to September.
  • South West monsoons are the rain-bearing seasonal winds that flow from the Arabian Sea towards India's mainland in the South-West direction.
• North-east monsoons:
  • When winds move back from the land to the sea, it is known as retreating monsoons. 
  • Retreating monsoons are also called north-east monsoons. 
  • October to December is referred to as the period of North-east monsoons
  • They start with the withdrawal of southwest monsoons.
  • The Tamilnadu receives the highest rainfall from the North-East monsoon.

The correct answer is Shark — Tortoise — Otter.

Key Points

• Shark - Scientists believe that sharks came into existence around 400 million years ago. It is believed that they descended from a small leaf-shaped fish that had no eyes, bones on fins.
  • These fish then evolved into two main groups of fish that are found today.
  • Bony fish and cartilaginous fish which include shark and Chimaira.
  • Sharks are on the top of the marine food chain and are the only huge marine reptiles that exist today.
• Tortoise is believed to have existed for 250 million years.
  • They belong to the reptile species of the family Testudinidae.
  • Tortoise has a hard shell to protect from the outside environment. They are believed to have evolved from very large body sizes of around 100 kgs. They are among the longest-living land animals in the world.
• Otters are believed to have existed on earth for the past 23 million years.
  • They have evolved significantly and have gone through many adaptations to survive till this time.

Additional Information

• They have the ability to move both on water and land except sea otters. The rest of the otters have webbed feet which help them to move in the water.
• They have five toes which help them to move on land as well. It is believed that they were once land animals only but they ended up going in the water to be safe from predators.
• It is also believed that the food sources were available in limited quantities on land so they started hunting in water to survive.

According to the given information:

So, the cube of the number 2 is 8.

But in the statement, 'eight' is called 'nine'.

Hence, the correct answer is "Nine".

The main triangle shown is in the given figure and this the total no. of triangle is 15. remaing triangle we can find out in the drawing the triangle in the image.

The logic followed is:

It is given that Rajat has 64% marks in 10th, an age of 27 years, and work experience of 5 years.

It is clearly mentioned in the criteria that 10th marks should be greater than 60% for job Quality check Engineer and greater than 65% for job Software Engineer.

Rajat got 64% marks in 10th and has work experience of 5 years.

Therefore, Rajat qualifies for the job of Quality check Engineer.

Hence, the correct answer is "Quality check Engineer".

The advent of ICT in education has resulted in the utilization of a number of varied technologies in education and training. These technologies are:

Teleconferencing:

• This method propagates meeting through telecommunication.
• Audio and video conferences, computer and web-based conferences are some of the types of teleconferencing methods available.
• The main advantages of this method of interactive communication is that it saves time, less expensive, caters to large audiences, allows flexibility and accessibility.
• It becomes easier to teach children in remote locations.
• Centralized teaching and real-time learning are also the advantages of teleconferencing.

Emailing: It is a means of exchanging information electronically. It can be used as a way of communication between the instructors and students.

Blogging: It is an online journal where thoughts and ideas about a subject can be shared with the readers. It can be used as an educational tool to foster a community of l

The stage of the embryo which nearly resembles a human being is called a fetus. Learning starts at fetal stage when a child starts reacting to different stimuli, as the sense organs are developed by this time.
The fetal nervous system starts developing very early in pregnancy. The main subdivisions of the brain are, in a basic form, visible at five gestational weeks. At about gestational weeks 25-29, the fetus is even able to hear internal (e.g. from the maternal gastrointestinal system) and external sounds. So, obviously the fetus gets a vague idea from the external environment through its senses, far before birth. Some studies even demonstrate that fetal heart rate patterns change distinctively, depending on whether the unborn child is exposed to the maternal voice or another female voice.

“A cloth covers a table. Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.” This is a very common phenomenon and can be seen when the cloth is pulled very quickly. But it can’t be explained by the 3rd Law of Motion.

In case of a meter bridge

For finding the value of R

For finding the value of ΔR

Therefore, R = (60 ± 0.25)Ω

Use equation of kinematics: v = u + at
Initial velocity, u = 3i + 4j
Acceleration, a = 0.4i + 0.3j
Time, t = 10s
v = (3i + 4j) + 10(0.4i + 0.3j)
v = (3i + 4j) + (4i + 3j)
v = 7i + 7j
|v| = √(7² + 7²) = 7√2

M=9x10^-31Kg,r=4.5x10^-10
V=8x10⁵m/s
L=mvr
  =9x10^-31 x 4.5 x 10^-10 x 8 x 10⁵ = 3.24 x 10^-34 kgm²s^-1

We have the relation between current I, n = no. of carrier per unit volume, drift velocity v_e and CSA A as.

I = neAv

Let current flowing in the 2nd wire I₂ = I thus current flowing through the 1^st wire I₁ = 4I

Let the radius of the first wire be r thus radius of the 2^nd wire = 2r

In the first wire

A₁ = πr²

In the 2^nd wire

A₂ = π(2r)² = 4πr²

I₁/ I₂ = (A₁v₁ )/(A₂v₂ )  (ne being same for two wires as they are made of the same material)

4I/I = πr² v₁/4 πr²v₂

=> v₁/v₂ = 16/1

=> v­₁:v₂ = 16:1

Thus ratio of the drift velocities are 16:1

For the formation of distinct beats, frequencies of two sources of sound should be nearly equal, i.e., difference in frequencies of two sources must be small, say less than 10. The impression of sound heard by ow ears persists on our mind for 1 /10th of a second. If another sound is heard before (1 /10) second passes, the impressions of the two sounds mix up and our mind cannot distinguish between the two. In order to hear distinct beats, time interval between two successive beats must be greater than 1 /10 second. Therefore, frequency of beats must be less than 1 0,i.e., number of beats/sec, which is equal to difference in frequencies of two sources must be less than 10. Hence the two sources should be of nearly equal frequencies. 

Let q charge is situated at themidposition of the lineAB.The distance between AB is x. A and B be the positions of charges Q and Q respectively.

• We know that with retardation of a car with an initial speed of 60 kmph stops after 20m.
• We know that v² = 2as  (third equation of motion). Thus we get that for some constant retardation, stopping distance is proportional to the square of the initial speed.
• Hence when the initial speed is 120kmph we get,
  s = 20 x (120/60)²
  s = 80 m

Second law of motion gives:

Electrostatics means charges at rest, or relatively at rest so this force can be applicable only when charge produce electric field which is constant which is possible only when charges at rest or relatively at rest.

The First minimum is located at the place where the central maximum ends. And the first minimum spreads further upto half the fringe width.

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 a conservative force.

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.
  • Example:  Frictional force, Viscous force, Airdrag, etc.

EXPLANATION:

• If a body is moved from position A to another position B on a rough table, work done against frictional force shall depend on the length of the path between A and B and not only on the position A and B.
• Therefore, in non-conservative force 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. Therefore option 2 is correct.

∵ V = (4/3)πr³
% error is volume = 3 × error in radius = 3 × 1 = 3%

Explanation:atomic hypothesis that all things are made of atoms—little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another.

Parachute bails out at height H from ground. Velocity at A:

According to Piaget's theory, children actively construct their understanding of the world through their experiences and interactions with the environment.

Key Points 

• It is well knowledge that young infants acquire significant concepts more quickly in their mother tongue or home language.
• The mother tongue or the language used by the neighborhood is typically the same as the home language.
• However, there may occasionally be a home language used by other family members in multilingual households that is distinct from the mother tongue or the local vernacular.
• National Education Policy 2020 proposes that wherever feasible, the home language, mother tongue, local language, or regional language will be used as the medium of teaching until at least Grade 5, but preferably until Grade 8 and beyond.

Hence, At the primary level, National Education Policy 2020 proposes mother tongue/Home language as the medium of instruction across the nation.

The correct answer is Option 4. The correct spelling is ‘embarrassment’. 

सही उत्तर वाचाल है।

Key Points

• 'मूक' का विलोम शब्द वाचाल है।
• मूक का अर्थ- गूँगा, मूक वाणी।
• वाचाल का अर्थ- वाक्पटु।

अन्य विकल्प -

• बड़ा - छोटा
• घृणा - प्रेम
• अचर - चर

'उत्थान' का विलोम शब्द पतन है।

उत्थान का विलोम पतन होता है।

• उत्थान का अर्थ - उठना
• पतन का अर्थ - गिरना

Key Pointsअन्य विकल्प -

• पातन का अर्थ होता है - नीचे ढकेलने की क्रिया या भाव
• पाटन का अर्थ होता है - छेदने की क्रिया
• पतान का कुछ अर्थ नहीं होता है।

Additional Informationविलोम के उदाहरण -

• मूक - वाचाल
• सम्पन्न - विपन्न
• सम्मुख - विमुख
• मितव्ययी - अपव्ययी
• स्मरण - विस्मरण
• नीरस - सरस
• पक्ष - प्रतिपक्ष
• ज्योति - तम
• अथ - इति