Indian Air Force Agniveer Science Subject Mock Test - 2 - Indian Air Force Agniveer Vayu MCQ

• A photocell is a practical application of the phenomenon of the photoelectric effect. 
• When the light of frequency greater than the threshold frequency of the cathode material falls on the cathode, photoelectrons are emitted.

• These electrons are collected by the anode and an electric current starts flowing in the external circuit.
• The current increases with the increase in the intensity of light. The current would stop, if the light does not fall on the cathode.

The slope of the graph   is maximum at C and hence the instantaneous velocity is maximum at C.

For train B,


Original distance between A and B = SB − SA = 2250m − 1000m = 1250m

The second law of motion is a local law which means that force `F` at a point in space (location of the particle) at a certain instant of time is related to a at that instant. Acceleration here and now is determind by the force here and now, not by any history of the motion of the particle.

If drops and bubbles do not collapse under the effect of gravity, it indicates that the pressure inside the drop is greater than the pressure outside. The greater inner pressure prevents the drop from collapsing.

As work is a path function rather than a state function, we can easily say that work can often be graphically represented as the area under the PV graph. And as cyclic processes are represented as closed shapes on PV graph it is obvious that they have non zero area and thus work done is non zero.

If you leave the door open, heat is merely recycled from the room into the refrigerator, then back into the room. A net room temperature increase would result from the heat of the motor that would be constantly running to move energy around in a circle.

n is the number of moles.

Electric field,

i.e., equipotential surfaces are closer in regions of large electric fields compared to regions of lower electric field. At sharp edges of a conductor, charge density is more. Therefore electric field is stronger. Hence equipotential surfaces are more crowded.

The frequency of radiation arising from the two close energy levels in hydrogen known as Lamb shift i.e. 1057 MHz is radio waves as it belongs to the short wavelength end of the electromagnetic spectrum.

We have mass – a particle property, in the same equation as wavelength – a wave property. Thus if matter exhibits wave properties, it must be given by equation (3). Equation (3) is the de Broglie equation and represents the wave-particle duality. Hence we say that everything in the Cosmos exhibits a dual nature.

An atom has a nearly continuous mass distribution in Thomson’s model, but has a highly non-uniform mass distribution in Rutherford’s model.

Binary number system, in mathematics, positional numeral system employing 2 as the base and so requiring only two different symbols for its digits, 0 and 1, instead of the usual 10 different symbols needed in the decimal system.

If A ∪ B = A ∩ B then A = B.
Example: Let A = {1, 2, 3, 4} & B = {1, 2, 3, 4}
(AUB) = (A⋂B)
⇒{1,2,3,4} = {1,2,3,4}

In triangle ABC,
► Sum of all three angles = 180⁰
► A + B + C = 180 = A + B = 180 - C 

devide by 2 both side 

A/2 + B/2 = 180/2 - C/2

nC12 = nC8
n/ 12 (n - 12) = n/8 (n - 8)
12 = n - 8
n = 12 + 8 = 20
n = 20.

T_(r+1) = ¹¹C_r x^(11-2r) (m/r)^r (-1)^r
= ¹¹C_r x^(11-2r) m^r (-1)^r
Coefficient of x³ = 11 - 2r = 3
8 = 2r 
r = 4
T5 = ¹¹C₄ x³ m⁴ (-1)
Coefficient of x³ = ¹¹C₄ m⁴
= 330 m⁴

Slope of line passing through (a,b) and (−a,−b) is given by (b+b)/(a+a) = b/a
So equation of line passing is given by (using slope point form)
y−b = b/a(x−a)
⇒ ay − ab = bx − ab
⇒ ay = bx
Clearly the point (a²,ab) lie on the above line

According to definition of parabola , is is the locks of the points in that planes that are equidistant from both focus and directrix.

Given, focus : (-3,0)
directrix : x + 5 = 0
Let (x ,y) is the point on the parabola .
∴ distance of point from focus = distance of point from directrix
⇒ √{(x + 3)² + y²} = |x + 5|/√(1² + 0²)
⇒ √{(x + 3)² + y² } = |x + 5|
squaring both sides,
(x + 3)² + y² = (x + 5)²
⇒y² = (x + 5)² - (x + 3)²
⇒y²= (x + 5 - x - 3)(x + 5 + x + 3)
⇒y² = 2(2x + 8) = 4(x + 4)

Hence, equation of parabola is y² = 4(x + 4)

d/dx(log|x|)
= 1/|x|

Hence equation of tangent to the given curve at (0 , 1) is :

(y−1) = 2(x−0),i.e..y−1 = 2x 

Therefore, tangent at (2, 3) is y – 3 = ½ (x – 2). i.e. x – 2y +4 = 0 . therefore required area is 

• Let's understand the meaning of the given word:
• Parley is a noun and it means a discussion between two groups of people, especially one that is intended to end an argument. 
  • Example: He has led disarmament talks and parleyed with NATO.
• By the meaning and example, we can say that 'Discuss' is a similar word for 'Parley.'

Hence option 1 is the correct answer.

Let us look at the usage of the given options:

• In: use for something inside or enclosed by something else.
• On: use for something resting upon or atop something else. 
• From: use to refer to the place where someone or something starts or originates. 

Her name is a hypothetical enclosed area, so in must be used in this sentence.
Correct sentence: Alex had provided the money to remodel the home, but insisted that it stay in her name only.

• The statement "they can be ordered by postcard" refers to the possibility of giving wedding presents, birthday presents, and Christmas presents without any thought of affection, and suggests that the process of choosing and giving these gifts may not involve much care.
• Therefore, option 2) "the choice does not involve much care" is the correct answer based on the references given in the passage.

Correct answer: "the choice does not involve much care.

The answer can be directly quoted from the second paragraph where the lines are given as,“ The Atharvaveda contains the Prithvi Sukta, which contains unparalleled knowledge about nature and the environment. It is beautifully written in Atharvaveda: Salutations to Mother Earth.” 

'An' is used before words that begin with a vowel sound. Note that we are talking about sounds and not spelling. The word "European" begins with the vowel letter 'e' but it is pronounced with the consonant sound. So, here we use 'A' as article.

One word substitute is Anarchist.

• Anarchist: a person who believes in or tries to bring about anarchy
• Belligerent: hostile and aggressive
• Iconoclast: a person who attacks or criticizes cherished beliefs or institutions
• Agnostic: a person who believes that nothing is known or can be known of the existence or nature of God

The given sentence is in active form of simple past tense. The structures for active/passive voices are:

• Active: Subject + verb (IInd form) + object.
• Passive: Object + was/were + verb (IIIrd form) + by + subject.

So, with the help of the above structures, we can convert the given sentence into passive voice:
I was looked up to by everyone.