Indian Air Force Agniveer Science Subject Mock Test - 10 - Indian Air Force Agniveer Vayu MCQ

• The radioactivity of uranium was discovered in 1896 by Henri Becquerel.
• Though it was Henri Becquerel that discovered radioactivity, it was Marie Curie who coined the term.

Additional Information: Marie Curie became the first woman to be awarded the Nobel prize and the first person to obtain two Nobel prizes when she won the prize for the discovery of Polonium and Radium in 1911.

Here, u = 0

We have, v² = u² + 2gh

= 20 m/s

Change in momentum = 0.15 x 12 - (-0.15 x 12)
= 3.6 N s

We can derive Newton’s third and first laws from the second law.

The correct option is C third and first laws from the second law
We can derive Newton's third and first laws from second law. If force on particle is zero, then according to Newton's second law

F=ma

0=ma

a=0 (Since mass cannot be zero)
So, this shows that the body moves with constant velocity or remains at rest if no external force on the system. This is the statement of first law itself.

Suppose an isolated system of two bodies A and B. Suppose A exerts force F₁ on B and B exerts F₂ on A. Now, rate of change of momentum of A is dp₁/dt and that of B is dp₂/dt. Therefore, from second law,

F₁=dp₁/dt …(i)

F₂=dp₂/dt …(ii)

Adding (��) and (����), we get

F₁+F₂=dp₁/dt+dp₂/dt

Since the system is isolated, so the total change in momentum or rate of change of momentum dp₁/dt+dp₂/dt should be zero. Thus, F₁+F₂=0 or F₁=−F₂.This is the statement of third law.

Since there is no different external force applied to the individual particles, the centre of mass remains same and does not shift.

Concept 

• : Newton's law of gravitation states 
• "Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres."

Explanation 

Newton's law of gravitation can be represented mathematically as: F = G x (m₁ x m₂/ r²)

Where:

• F is the force of attraction between the two bodies.
• m1 and m2 are the masses of the two bodies.
• r is the distance between the centres of the two bodies.
• G is the gravitational constant, a proportional constant that in the SI system is approximately 6.674 x10^-11N(m/kg)².
• So, if you have two bodies with masses m1 and m2, and they are separated by a distance r, then the force of gravity between them is directly proportional to the product of their masses and inversely proportional to the square of the distance between them,
• Real-world applications of this law include everything from explaining the motion of planets in our solar system to the rolling of a ball down a hill. It's one of the cornerstones of classical physics and is essential in understanding the larger structure of the universe.

We know that if frequency of an external forced  oscillation is equal to the natural frequency of the body, then amplitude of the forced oscillation of the body becomes very large. This phenomenon is known as resonant vibration. Therefore, resonance is an example of forced vibration.

Van de Graff generator- is an electrostatic generator which is devised to produce very high voltage by means of an endless belt collecting electrostatic charge from a source and transferring it to a large isolated metal sphere on which a large change accumulates.

• Both potentiometer and voltmeter are devices to measure potential difference.
• EMF is the terminal p.d between the electrodes of a cell in open circuit, i.e., when no current is drawn from it.
• Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection.
• So, accurate measurement of p.d is done using a potentiometer.

The electromagnetic waves are not mechanical waves. There are vibrations of electric vectors and magnetic vectors in them. These vibrations do not need any particles present in the medium for their propagation. That's why electromagnetic waves do not require any medium for propagation.This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

When light moves from 1 medium to another, refraction takes place. And when light enters a denser medium, the ray bends away from normal and meets at a point above the actual point where they would have met, if the medium was absent. So, apparent depth decreases.

Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it. In a broader definition, the radiant energy may be infrared, visible, or ultraviolet light, X-rays, or gamma rays; the material may be a solid, liquid, or gas; and the released particles may be ions (electrically charged atoms or molecules) as well as electrons.

Concept:

• As per Indian standard for domestic power supply we use A.C current, which is also known as alternating current since they change its polarity at a certain interval of time.
• Now the two principal properties of the A.C electric power supply are Voltage and frequency.
• And we use 220 V and 50 Hz power supply for our common domestic use
• Where 220 V is the potential difference and 50 Hz is its frequency.

Explanation: 

The voltage and frequency of domestic power supply used in India are 220 volt and 50 Hz respectively

In quadrant sin, cos tan, cot, sec, cosec all +ve .In second quadrant sin and cosec are +ve. in 3rd quadrant tan and cot are positive.And in 4th cos and sec are +ve.

2x² - 4x + 3 = 0
x = [-(-4) +- (√16-24)]/2(2)
x = (4 +- i√8)/4
x = (4 +- 2i√2)/(2 * √2 * √2)
x = 2(2 +- i√2)/(2 * √2 * √2)
x = 1 +- i/√2

T_(r+1) =  ⁿC_r x^n-r a^r
T_(r+1) =  ^n-5Cr xn-5-r (1/x⁴)^r
= ^n-5C_r x^n-5-r (1/x^4r)
= ^n-5C_r x^n-5-5r 
=> n - 5 - 5r = 2r
=> n - 2r = 5(r + 1)

Line y = 0  is X-axis slope of this line = 0 = m1 
line x-y = 0 is y = x which is passes through (0,0)  slope of this line = 45 = m2
tanФ = (m2-m1)/(1-m1m2) = (1-0)/(1-1*0)
        = 1/1 = 1
tanФ =1 
Ф = 45

√x / √(16+√x) - 4

= (√x * √(16+√x) + 4) / ( √(16+√x) - 4) * (√(16+√x) + 4)

= (√x * √(16+√x) + 4) / 16+√x - 16

= √(16+√x) + 4

now at lim x->0

= √16 + 4 = 8

A vector whose initial and terminal points coincide has no particular direction and 0 magnitude. Therefore, it is called zero vector.

• Meaning of vent: An opening that allows air, gas, or liquid to pass out of or into a confined space.
• Meaning of Opening: a space or gap that allows passage or access
• Meaning of Stodge: food that is heavy, filling, and high in carbohydrates
• Meaning of End: a final part of something, especially a period of time, an activity, or a story.

Commissioned means come to starts and terminated means comes to end. Commission means mission or we can also called as a special group delegated to consider some matter. Termination means a coming to end of a contract period. The antonym for the commission is probit.

This statement is wrong: To do it

Correct Statement will be: In doing it.

through his hat:  to talk about something without understanding what you are talking about.

Hence, the correct answer is option a i.e. talking nonsense.

Businessman start business in market his link very high so didn't get convinced people and easily call business partner to import products.

So option B is correct

available and that too at cheaper prices.

So Option D is correct

Sentence 3 is the leading sentence as it introduces the character 'Sally' who walks out of the hospital. After coming out of the hospital, she goes back home in 'car' (sentence 1). 'Drive' in sentence 6 refers to 'car' in 1. So, 6 follows 1. Sentence 4 intensifies the situation ('even harder') and falls next in the sequence. After reaching the 'empty house', she carries 'Jimmy's belongings' to the room (sentence 2) and places the stuff there (sentence 5). Sentence 5 follows sentence 2, as 'his' in 5 refers to 'Jimmy' in 2. The correct sequence is: 3-1-6-4-2-5.

The context is 'problems of wildlife used in performances'. The sequence is 1-4-3. In sentence 4, their natural behaviour is explained 'In the wild ... roam ... hunt ... sleep ...' and sentence 3 is directly related to it 'none of these behaviour', so 4-3 are linked. Sentence 2 is out of context as it is does not relate to any other sentence and is also not related to the problems of wildlife used in performances.

Refer to, “States must be aware of the scientific consensus: that future rain spells may be short, often unpredictable and very heavy influenced by a changing climate.”

It is clear from the passage that the future rain spells will not be very much predictable since there will be rains sometime very heavily and it will mainly be because of the changing climate in India as well as in other areas of the world. The scientific community has already explained that it is going to be the future of monsoon and the states should be prepared to handle such situations. Among the given options, we can easily choose Option D for this since it gives us the correct information whereas the rest can be eliminated for being irrelevant in the context of the passage.

This makes Option D the correct choice among the given options.

The one word substitution is Polygamy.

Misogamy : the hatred of marriage.
Bigamy : the offence of marrying someone while already married to another person.
Monogamy : the practice of marrying or state of being married to one person at a time.
Polygamy : the practice or custom of having more than one wife or husband at the same time.