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UP PGT Physics Mock Test - 10 - UPTET MCQ


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30 Questions MCQ Test - UP PGT Physics Mock Test - 10

UP PGT Physics Mock Test - 10 for UPTET 2024 is part of UPTET preparation. The UP PGT Physics Mock Test - 10 questions and answers have been prepared according to the UPTET exam syllabus.The UP PGT Physics Mock Test - 10 MCQs are made for UPTET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for UP PGT Physics Mock Test - 10 below.
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UP PGT Physics Mock Test - 10 - Question 1

A hollow cylinder has a charge q coulomb within it. If f φ is the electric flux in units of volt meter associated with the curved surface B, the flux linked with the plane surface A in units of V-m will be 

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 1

Let φA, φB and φC are the electric flux linked with surface is A, B and C.
According to Gauss theorem,

UP PGT Physics Mock Test - 10 - Question 2

A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 2

We know, a piece of copper is a metal while that of germanium is a semiconducting material. For metals resistance increases with increase in temperature. The semiconductor has a negative temperature coefficient of resistance. Hence, when it is cooled its resistance increases.

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*Multiple options can be correct
UP PGT Physics Mock Test - 10 - Question 3

Two charges 4q and q are placed 30 cm. apart. At what point the value of electric field will be zero

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 3

Where E=0 this point is called neutral point.
it is the point where electric field of both charge is same
we know tha t E=kQ/r^2
here k=1/4pi€
for 4q charge
let at ''a'' distance we get E=0 which is from q charge
so distance from 4q of 'a' point is 30-a
electric field by 4q charge on a is
E=k4q/(30-a)^2
electric field by q charge on a point
E=kq/a^2
both electric field are equal so put them equal
k4q/(30-a)^2=kq/a^2
solve this we get
4a^2=(30-a)^2
2a=30-a
3a=30
a=10
so at a distance 10cm from charge q we get E=0
distance from 4q charge 30-10=20cm.

 

UP PGT Physics Mock Test - 10 - Question 4

Find the true statement.

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 4

The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.

UP PGT Physics Mock Test - 10 - Question 5

What is the capacitive reactance of 6 x 10-6 F capacitor for frequency of 106 Hz?​

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 5

Xc ≈ 0.026 Ohms

UP PGT Physics Mock Test - 10 - Question 6

The terminal voltage across a battery of emf E can be

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 6

Potential difference(V) across the terminals of a cell
i. Discharging of cell when cell is supplying current,
Therefore, V=VP+VQ=E-Ir, i,r., V<E
ii. charging of cell when cell is taking current,
V=VP-VQ=E+Ir, i.e., V>E
iii. When the cell is short circuited i.e., external resistance is zero,
=> I=E/r
=>  V=VP-VQ=E-Ir=0 i.e., V=0

UP PGT Physics Mock Test - 10 - Question 7

To get the maximum flight, a ball must be thrown as

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 7

Velocity of ball at top = V1 = VT + VCOM

Velocity of ball at bottom = V2 = | VT – VCOM |

V1 >> V2 than other option.

∴ More pressure difference is created because

 constant

UP PGT Physics Mock Test - 10 - Question 8

Difference between nth and (n + 1)th Bohr's radius of `H' atom is equal to it's (n _ 1)th Bohr's radius. The value of n is

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 8

We know that rn​∝n2
Given: rn+1​−rn​=rn−1
∴(n+1)2−n2=(n−1)2
n=4

UP PGT Physics Mock Test - 10 - Question 9

The mutual inductance has unit of-

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 9

The unit of inductance in the SI system is the henry (H), named after American scientist Joseph Henry, which is the amount of inductance which generates a voltage of one volt when the current is changing at a rate of one ampere per second.

UP PGT Physics Mock Test - 10 - Question 10

At any point on an electric field line 

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 10

When a tangent is drawn at any point on field line then that tangent gives the direction of electric field at that point

UP PGT Physics Mock Test - 10 - Question 11

If the force acting on a point charge kept on the axis of an electric dipole is F, what will be the amount of force if the distance of the point charge is doubled from the dipole?

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 11

If the distance of a point charge, kept on the axis of a dipole, is sufficiently large than the separation between the charges of a dipole, then it can be shown that electric field E at a distance r from the dipole varies as E α 1/r3. Now if the distance becomes 2r, electric field intensity will decrease by a factor of 23=8 times. Therefore the force F will now become F/8.

UP PGT Physics Mock Test - 10 - Question 12

A large open tank has two holes in the wall. One is a square hole of side L at a depth y from the top and the other is a circular hole of radius R at a depth 4y from the top. When the tank is completely filled with water, the quantities of water lowing out per second  from both holes are the same. Then R is equal to

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 12

UP PGT Physics Mock Test - 10 - Question 13

A force of 20 N is applied on a body of mass 4 kg kept on a rough surface having coefficient of friction 0.1. Find acceleration of body. Take g = 10 m/s2

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 13

 

UP PGT Physics Mock Test - 10 - Question 14

Find out the value of current through 2Ω resistance for the given circuit.

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 14

The current in 2W resistor will be zero because it is not a part of any closed loop.

UP PGT Physics Mock Test - 10 - Question 15

A charged particle of charge q and mass m is released from rest in an uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after time 't' seconds is

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 15

Force on particle=F=qE
Hence, acceleration of particle=a=F/m​=qE/m​
Initial speed=u=0
Hence, final velocity=v=u+at=qEt/m​
Kinetic energy=K=(1/2)​mv2=(1/2)​m(qEt/m​)2
⟹K=E2q2t2​/2m

UP PGT Physics Mock Test - 10 - Question 16

Photons with energy 5eV are incident on a cathode C, on a photoelectric cell. The maximum energy of the emitted photoelectrons is 2eV. When photons of energy 6eV are incident on C, no photoelectrons will reach the anode A if the stopping potential of A relative to C is

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 16

When 5eV is incident the kinetic energy is 2eV it simply means the work function is W=5eV−2eV=3eV
Similarly, when 6eV is incident the kinetic energy should be   6eV−W=6eV−3eV=3eV
 it simply means to stop them we need a negative potential at anode equal to 3eV/e​=3V
So, the answer is −3V i.e. option B is correct.

UP PGT Physics Mock Test - 10 - Question 17

The modulus of elasticity of steel is greater than that of rubber because under the same stress

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 17

Modulus of elasticity= stress/strain =(F/A)/(ΔL/L) So, for same stress Modulus of elasticity ∝( L/ΔL)and ΔL for rubber is more as compared to steel so Modulus of elasticity for rubber will be less as they are inversely proportional and also ΔL/L is less for steel

UP PGT Physics Mock Test - 10 - Question 18

The slope of velocity-time graph for motion with uniform velocity is equal to:

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 18

When velocity is uniform, velocity-time graph is straight line parallel to time axis. So, the slope is zero.

UP PGT Physics Mock Test - 10 - Question 19

Electric flux density is a function of _______.

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 19

Electric flux density is the charge per unit area. Hence it is a function of charge and not any of the other values.

UP PGT Physics Mock Test - 10 - Question 20

A magnetic field  exists in the region a < x < 2a, and , in the region 2a < x < 3a, where B0 is a positive constant. A positive point charge moving with a velocity , where v0 is a positive constant, enters the magnetic field at x = a. The trajectory of the charge in this region can be like

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 20

Use the vector for m of B and v in the formulae to get the instantaneous direction of force at x = a and x = 2a.

 

UP PGT Physics Mock Test - 10 - Question 21

Minimum work is said to be done when a gas expands

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 21

An isobaric expansion of a gas requires heat transfer to keep the pressure constant. An isochoric process is one in which the volume is held constant, meaning that the work done by the system will be zero.

UP PGT Physics Mock Test - 10 - Question 22

Consider a solid cube made up of insulating material having a uniform volume charge density. Assuming the electrostatic potential to be zero at infinity, the ratio of the potential at a corner of the cube to that at the centre will be 

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 22

By dimensional analysis

but by superposition

Because of the centre of the larger cube lies at a corner of the eight smaller cubes of which it is made
therefore,

*Multiple options can be correct
UP PGT Physics Mock Test - 10 - Question 23

Figure shown plane figure made of a conductor located in a magnetic field along the inward normal to the plane of the figure. The magnetic field starts diminishing. Then the induced current

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 23


As the field diminishes the current is induced in the coils such that if opposes the diminishing of the field. Hence, current is induced in clockwise directing in both the loops.
And as the loops are closed no current will come out of the loops and no current at point R.
Hence option A C D is the correct option.

UP PGT Physics Mock Test - 10 - Question 24

Electric field intensity at point ‘B’ due to a point charge ‘Q’ kept at a point ‘A’ is 12 NC-1 and the electric potential at a point ‘B’ due to same charge is 6 JC-1. The distance between AB is​

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 24

E.l = V   where,
E = electric field intensity = 12 N/C
V = electric potential = 6 J/C
=> distance between A and B, 
l = (6 / 12) m or (1 / 2) m = 0.5 m
 

UP PGT Physics Mock Test - 10 - Question 25

A body is thrown with a velocity of 10m/s at an angle of 60 degrees with the horizontal. Its velocity at the highest point is: 

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 25

At the highest point, its vertical velocity will become zero. Hence the only left velocity is horizontal which remains unchanged and is equal to 10 cos 60 = 5m/s

UP PGT Physics Mock Test - 10 - Question 26

In the pulley-block arrangement shown in figure, find the relation between acceleration of block A and B  

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 26

x1 + x3 = l

Differentiating with respect to time,

  we get,  v1 + v3 = 0

  Again differentiating with respect to time, 

Differentiating with respect to time,  v1 + v2 – 2v3 = 0  

Again differentiating with respect to time, a1 + a2 – 2a3 = 0  

UP PGT Physics Mock Test - 10 - Question 27

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 27

Here,
Aperture, a = 4 mm = 4 × 10-3 m
Wavelength, λ = 400 nm = 400 × 10-9 m = 4 × 10-7 m 

Ray optics is good approximation upto distances equal to Fresnel's distance (ZF).
Fresnel's distance is given by,

UP PGT Physics Mock Test - 10 - Question 28

The average power dissipation in pure resistive circuit is:

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 28

Power=IV
Where I=Vrms value of current=IV
And V=Vrms value of voltage=EV
Therefore, P=EVIV

UP PGT Physics Mock Test - 10 - Question 29

Population of a town is reported as 157,900 . Which of the following statements correct?

Detailed Solution for UP PGT Physics Mock Test - 10 - Question 29

157900  implies that the population is believed to be within the range of about 157850 to about 157950.

In other words, the population is 157900 ± 50. The “plus-or-minus 50” appended to this number means that we consider the absolute uncertainty of the population measurement to be 50 – (–50) = 100.

We can also say that the relative uncertainty is 100/157900, which we can also express as 1 part in 1579, or 1/1579 = 0.000633, or about 0.06 percent.

*Answer can only contain numeric values
UP PGT Physics Mock Test - 10 - Question 30

In the circuit in figure we have ε1 = ε2 = 100V, R1 = 20Ω, R2 = 10 Ω, R3 = 40 Ω and R4 = 30 Ω. Find the reading of the ammeter (in A). Disregard the resistance of the battery and the ammeter.


Detailed Solution for UP PGT Physics Mock Test - 10 - Question 30


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