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

In education process aim, content and methods are evaluated.

Evaluation is concerned with assessing the effectiveness of teaching, teaching strategies, methods and techniques. It provides feedback to the teachers about their teaching and the learners about their learning.

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 must provide ask a few more questions on the same topic, so that the student arrives at the exact correct answer. The student thus would be left with a lasting impression and hence will not forget it for long time.

The period of a particle in circular motion is the time taken to complete one full revolution. The period is given by T = 2π/ω, where ω is the angular velocity. Angular acceleration, α, does not affect the period directly. The angular acceleration determines how quickly the angular velocity changes, but it does not affect the time taken for one complete revolution. Therefore, if the angular acceleration is doubled, the period of the particle's motion will remain the same.

Bernoulli's theorem, in fluid dynamics, relation among the pressure, velocity, and elevation in a moving fluid (liquid or gas), the compressibility and viscosity (internal friction) of which are negligible and the flow of which is steady, or laminar.

Dimension of N = [L - 3]

At the highest point of its flight, the vertical component of velocity is zero and the only horizontal component is left which is u_x = u cosθ
Given θ = 45⁰

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.

Though water and ammonia are covalent molecules, they have a net dipole moment due to their distorted structure than the ideal one. Hydrochloric acid has a linear molecular structure but its net dipole moment is towards the Hydrogen atom. But methane has a symmetrical tetrahedral structure and its net dipole moment is zero hence it doesn’t behave as a permanent dipole. Methane solvents are therefore non-polar solvents.

Answer :- d

Solution :- The negative sign is just a convention and it signifies that the direction of E is opposite to the direction in which potential increases.

Voltage is induced due to change in the magnetic flux through a closed loop.
Here 
Magnetic Flux = ϕ=BA=const.
Hence
Induced EMF = dtdϕ​=0
Induced current =i=E/R=0

Given that λ = 200nm, d=700nm
θ = λ/d
We know that maximum angle can be 90⁰
No of rings that can be obtained say n,

If θ is so small then −

The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year. 

In an inductor, current lags behind the input voltage by a phase difference of π/2.
Current and voltage are in the same phase in the resistor whereas current leads the voltage by π/2 in a capacitor.
So, the circuit must contain an inductor only.

In this question, the cars are identical means the coefficient of friction between the tyre and the ground is the same for both the cars, as a result, retardation is the same for both the cars equal to mg.
Let first car travel distance s₁, before stopping while second car travel distance s₂, then from v² = u² - 2as

Consider the surface facing upwards having points A, B, C and D in anticlockwise direction when viewing towards the surface from above. Let this be S
flux = S×B
As the flux increases, by Lenz's Law the induced current will be in the direction C B A D C, so as to oppose the increase in flux.

Total initial angular momentum = I₁ω₁ + I₂ω₂ 

When the discs are joined together, total moment of inertia about the axis becomes I₁ + I₂​.

Let the angular speed of the two-disc system be ω.

Then, from conservation of angular momentum:

Weight is a force caused by gravity. The weight of an object is the gravitational force between the object and the Earth. The more mass the object has the greater its weight will be. Weight is a force, so it's measured in newtons.

Electric flux = electric field intensity x area. The dimension of field intensity is [M L T^-3 I^-1] and the dimension of the area is [L²]. Therefore, the dimension of flux = [M L³ T^-3 I^-1]. This can also be justified as flux=potential x length. By putting the dimensions of potential and length, we can get the same result.

 Answer :- b

Solution :- In a purely inductive circuit (an AC circuit containing inductance only) the current lags behind the voltage by π/2

 Option is not correct because there is relation between current & voltage in inductance

d ∝ 1/r

The formula for magnetic flux is Φ = B × A × cosθ, where θ is the angle between the magnetic field (B) and the normal to the surface (area vector A).

Since the plane of the strip is at 60° to the field, the normal is at 30° to B.

Given: Φ = 1 mWb = 1 × 10⁻³ Wb, A = 0.02 m², θ = 30°.

So, B = Φ / (A × cos30°)
cos30° = √3/2 ≈ 0.866
B = (1 × 10⁻³) / (0.02 × 0.866) = (1 × 10⁻³) / 0.01732 ≈ 0.058 T

Therefore, the correct answer is 0.058 T.

Block will slip on the slab as F > f_lim Hence kinetic friction acts between block and slab,

Components connected in parallel provide alternative pathways for current flow. When cells are connected in parallel, the total voltages that they provide does not change. For example, when two or more 2 V cells are connected in parallel, they still provide a total voltage of 2 V.

Explanation:

If a vector is multiplied by a scalar as in  pA^→ ,  then the magnitude of the resulting vector is equal to the product of p and the magnitude of  A^→, and its direction is the same as  A^→ if p is positive and opposite to  A^→ if p is negative.

Distributive law for scalar multiplication:

p(A^→ +B^→ )=pA^→ +pB^→ 

Explanation:

The theory for ideal gases makes the following assumptions

1. Gases consist of particles in constant, random motion. They continue in a straight line until they collide with something—usually each other or the walls of their container.

2. Particles are point masses with no volume. The particles are so small compared to the space between them, that we do not consider their size in ideal gases.

3. No molecular forces are at work. This means that there is no attraction or repulsion between the particles.

4. Gas pressure is due to the molecules colliding with the walls of the container. All of these collisions are perfectly elastic, meaning that there is no change in energy of either the particles or the wall upon collision. No energy is lost or gained from collisions.

5. The time it takes to collide is negligible compared with the time between collisions.

6. The kinetic energy of a gas is a measure of its Kelvin temperature. Individual gas molecules have different speeds, but the temperature and kinetic energy of the gas refer to the average of these speeds.

7. The average kinetic energy of a gas particle is directly proportional to the temperature. An increase in temperature increases the speed in which the gas molecules move.

8. All gases at a given temperature have the same average kinetic energy.

9. Lighter gas molecules move faster than heavier molecules.

According to the problem time for 20 oscillations of a pendulum 

t₁ ​= 3 9.6s,  t₂ ​= 39.9s,  t₃​ =3 9.5s

It is quite obvious from these observations that the least count by the water is 0.1s. As measurements have only one decimal place.

► Precision in measurement = least count of measuring instrument = 0.1s

► Precision in 20 oscillations = 0.1

Therefore, Precision in 1 oscillation = 0.1/ 20​= 0.005.

Explanation:The induced electromotive force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit.