AWES TGT Physics Mock Test - 5 - AWES TGT/PGT MCQ

Israel Aerospace Industries (IAI) is the aerospace and defence company that set up AeroSpace Services India (ASI) as its Indian subsidiary. This move signifies IAI's expansion into the Indian market, with ASI being authorized as the sole OEM's Technical Representative for the medium-range surface-to-air Missile (MRSAM) system in India.

Conventional or traditionally used sources of energy are usually Non-renewable sources of energy that have been used extensively for a long time and are now their sources of energy are depleting because of unsustainable uses. 

Important Points

Hydro energy has been used by people for a long time and is generally known as a renewable resource.

• However, with rising global temperature owing to the Greenhouse effect and Global Warming there have been uneven effects across the globe on Water bodies including polar caps.
• Water levels are rising but the availability of it in usable forms is becoming difficult to sustain.

Hence, it is sometimes categorized as a Conventional Source of energy.

Key Points

The following are unconventional sources of energy in the sense that they are less extensively used by people and are renewable sources of energy-

• Solar Energy- use of insolation received from the Sun on the Earth by using solar panels to convert the energy to the desired form 
• Wind Energy-use of wind speed moving the blades of Windmill. The wind is required to blow at a minimum of 14.3 meters per hour. 
• Tidal Energy- uses the high and low tides to produce energy in usable forms. 

The 91st Interpol General Assembly, led by the Indian delegation comprising the Central Bureau of Investigation (CBI) and National Investigation Agency (NIA), emphasized denying safe havens to crime. It took place in Vienna, Austria.

Diagnostic evaluation has a placement function and so takes place before instruction. It is used to determine underlying causes of learning difficulties. Diagnostic evaluation may include administration of standardised achievement tests, standardised diagnostic tests, teacher-made tests, observation and checklists. Scoring and interpretation can be normative (based on norms) or criterion-referenced. Results are usually shown as an individual profile of sub-skills.

The teacher can deal with the individual differences of the students if she is aware of the abilities, interest and aptitudes of each student. She can then concentrate on each student and help them overcome the difficulties that they have.

When an object is thrown from a height a continuous gravitational acceleration acts upon the body and hence time of flight can written equal to√2gs when we consider initial velocity to be zero. Now as we can see even if initial velocity is not zero, time of flight does not depend upon the mass of the body. Hence the time of flight is always the same ideally.

In SI units, permeability is measured in Henries per meter H/m or Hm−1.
Henry has the dimensions of [ML²T⁻²A⁻²].
Dimensions for magnetic permeability will be [ML²T⁻²A⁻²]/[L]=[MLT⁻²A⁻²]

Simple pendulum is not a case of ideal SHM as it is mention in NCERT.
Shadow of a point mass having uniform circular motion on the horizontal diameter is a case of SHM but not on the vertical diameter.

The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged bodies is conventionally known as the electrostatic force. 

A photon is massless, has no electric charge, and is a stable particle. In vacuum, a photon has two possible polarization states. The photon is the gauge boson for electromagnetism, and therefore all other quantum numbers of the photon (such as lepton number, baryon number, and flavour quantum numbers) are zero.
 

The formula for the MOI of a uniform semicircular ring about a perpendicular line is ½ Mr²

The polarization angle (also called Brewster's angle)is defined as the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection.
Brewster's Law states that the tangent of the angle of polarization is numerically equal to the refractive index of the medium.
μ = tan i ...................... (1)
From Snell's law:
μ = sinr sini​ ....................(2)
Comparing (1) and (2)
cos i = sin r = cos (2π​ - r)
i.e. i = (2π​ - r)
So, i + r = 2π​
So, as seen from the diagram, if i + r = 90^o Then the angle between reflected ray and refracted ray will be 180^o - 90^o = 90^o

• Eddy currents are the currents which are induced in a conductor whenever the amount of linked magnetic flux with the conductor changes.
• These were discovered by Foucault in the year 1895 and hence they are also called Foucault currents.

Eddy currents:

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.
 

Long-sighted people who have lost their spectacles can still read a book by looking through a small (3-4 mm) hole in a sheet of paper because by doing so due to the diffraction at the hole the focal length of the eye lens is effectively decreased. Hence the correct option is C.
 

In liquids the current is carried by ions. Ions are charged particles (atoms or groups of atoms). Ions can either be positive or negative, the positive ions being attracted to the negative plate and the negative ions to the positive plate. A positive ion is a particle with some negative charge taken away and a negative ion is a particle with some extra negative charge added.

Given:

• Original distance between plates = d

• Dielectric medium = air (or vacuum)

• Original capacitance (C0) = (epsilon0 * A) / d
  where A is plate area, and epsilon0 is the permittivity of free space.

Effect of Introducing a Metal Plate:

When a metal plate of thickness d/2 is inserted between the plates without touching them, it splits the capacitor into two capacitors in series:

1. First capacitor: between original plate and metal plate (separation d1)

2. Second capacitor: between metal plate and other plate (separation d2)

Since the metal plate is thin and placed symmetrically:
d1 + d2 = d - t = d - d/2 = d/2

If the metal plate is exactly in the middle, then:
d1 = d2 = d/4

New Capacitance Calculation:

Each of the two capacitors has capacitance:
C1 = C2 = (epsilon0 * A) / d1 = (epsilon0 * A) / (d/4) = (4 * epsilon0 * A) / d

When connected in series, the equivalent capacitance (Ceq) is:
1 / Ceq = 1 / C1 + 1 / C2
=> 1 / Ceq = d / (4 * epsilon0 * A) + d / (4 * epsilon0 * A) = d / (2 * epsilon0 * A)
So, Ceq = (2 * epsilon0 * A) / d

Comparison with Original Capacitance:

Original capacitance (C0) = (epsilon0 * A) / d
New capacitance (Ceq) = (2 * epsilon0 * A) / d = 2 * C0

Conclusion:
The capacitance doubles when a metal plate of thickness d/2 is introduced.

Answer: (b) It will be double of its initial value.

For the combination of lens,
Here, u = −40 cm, v = +80 cm,f = ?

⇒ f₂ = −400cm

The situation is shown in the figure.
F_E= Force due to electric field F_B = Force due to magnetic field It is given that the charged particle remains moving along X-axis (i.e. undeviated). Therefore  F_B = F_E

The needle will point along W-E if the result of the earth’s magnetic field and magnetic field due to the coil have a resultant in the W-E direction. This happens if B cos 45^o=Earth's field
⟹ (μ0​nI​/2r) cos45^o=(4π×10−7×30×0.35​)/(2×0.12) ×(1/√2)​​=0.39G=Earth's magnetic field.

The angle of incidence = 90^∘ - 47.5^∘ = 42.5^∘
Now by snells’ laws we get 
sin r = sin 42.5^∘ / 1.66^∘
Thus we get r = 24.01^∘
Thus the angle with surface = 90^∘ -24.01^∘ = 65.99^∘

Cos Ø is called a power factor that indicates what fraction of [(Voltage V) x (Current I)] becomes the useful power. Most electric circuits have resistance and inductance. In such an electric circuit, the current lags the voltage by the phase difference.

The rules for rounding off are following:

• If the first non-significant digit is less than 5, then the least significant digit remains unchanged.
• If the first non-significant digit is greater than 5, the least significant digit is incremented by 1.
• If the first non-significant digit is 5, the least significant digit can either be incremented or left unchanged.
• All non-significant digits are removed.

So rounding off 34.216 upto 4 digits is 34.22 and upto 3 digits is 34.2

Angular momentum is equal to L = Iω. It is the formula.

The two physical quantities which do not have the same dimensions can’t be added or subtracted in the same expression because doing so would lead to equating two quantities of different dimensions, which is non possible. Ex [F]  [P].

a car battery of 12V provides a current of about 200A, which is the current needed to operate a starter motor. So a battery has a very small internal resistance.
also,The cause of non-correctable battery problems and.A weak cell holds less capacity and is discharged more quickly.

• A potentiometer is considered to be sensitive if the potential gradient dV/dl is low.
• Such a potentiometer can measure very small changes in potential difference.
• Increasing the length of the potentiometer wire decreases the potential gradient. Its sensitivity increases. Increasing potential gradient decreases the sensitivity.
• Increasing the emf of the primary cell and by decreasing the length, potential gradient increases.