Special Ediition @organised notes

 

Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is :
a. 13/10 t
b. 13/5 t
c. 10/13 t
d. 5/13 t

 Answer ▽ 

Ans. (B) Mapping : Concept explained on Page-296 and question matching with solved example-11.8

and Exercise question-11.22 @352 Page number.

XIth Physics

Reference 2 -NCERT Solutions for Class 11 Physics Chapter 11 Thermal Properties of matter (organisednotes.blogspot.com)

Reference 1-

Reference 2-

Question 11. 22. A body cools from 80 °C to 50°C in 5 minutes. Calculate the time it takes to cool from 60 °C to 30°C. The temperature of the surroundings is 20 °C.
Answer:

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Match column - I and column - II and choose the correct match from the given choices.

	Column - I		Column - II
(A)	Root mean square speed of gas molecules	(P)	$\frac{1}{3}nm{\overline{v}}^2$
(B)	Pressure exerted by ideal gas	(Q)	$\sqrt{\frac{3RT}{M}}$
(C)	Average kinetic energy of a molecule	(R)	$\frac{5}{2}RT$
(D)	Total internal energy of 1 mole of a diatomic gas	(S)	$\frac{3}{2}{k}_{B}T$

1. (A) - (Q), (B) - (P), (C) - (S), (D) - (R)

2. (A) - (R), (B) - (Q), (C) - (P), (D) - (S)

3. (A) - (R), (B) - (P), (C) - (S), (D) - (Q)

4. (A) - (Q), (B) - (R), (C) - (S), (D) - (P)

 Answer ▽ 

1

Mapping : Direct question based on formule mentioned on Page-329, 332-333, 334, 337.XIth

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Polar molecules are the molecules :
a. having zero dipole moment.
b. acquire a dipole moment only in the presence of electric field due to displacement of charges.
c. acquire a dipole moment only when magnetic field is absent.
d. having a permanent electric dipole moment.

 Answer ▽ 

D

Mapping : Based on direct theory concept on Page-71 XIIth

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.
a. current in n-type = current in p-type
b. current in p-type > current in n-type
c. current in n-type > current in p-type
d. No current will flow in p-type, current will only flow in n-type

 Answer ▽ 

C

Mapping : Direct question on mobility of charge careers explained in Current electricity on Page-100. As explained on Page-474-477 about extrinsic semiconductors, it is clear that mobility of electrons in n-type semiconductors is more than mobility of holes in p-type semiconductors. XIIth 

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A radioactive nucleus AZX undergoes spontaneous decay in the sequence
AZX → z-1B → z-3C → z-2D, where Z is the atomic number of element X. The possible decay particles in the sequence are:
(1) α, β-, β+
(2) α, β+, β-
(3) β+, α, β-
(4) β-, α, β+

 Answer ▽ 

Correct answer: (3) β+, α, β-

Explanation:

AZX + β+→ z-1B + α → z-3C + β-→ z-2D

β+ decreases atomic number by 1

α decreases atomic number by 2

β- increases atomic number by 2

Mapping : This question is based on concept explained on Page-449-450 and it also matches with similar concept question-13.6

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Column-I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match Column-I and Column-II with appropriate relations. a. (A)-(R), (B)-(S), (C)-(P), (D)-(Q) b. (A)-(R), (B)-(S), (C)-(Q), (D)-(P) c. (A)-(R), (B)-(P), (C)-(S), (D)-(Q) d. (A)-(R), (B)-(Q), (C)-(S), (D)-(P)

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle θ to the horizontal, the maximum height attained by it equals 4R. The angle of projection, θ, is then given by : a. θ=cos^(-1)⁡〖((gT^2)/(π^2 R))^(1⁄2) 〗

b. θ=cos^(-1)⁡〖((π^2 R)/(gT^2 ))^(1⁄2) 〗

c. θ=sin^(-1)⁡〖((π^2 R)/(gT^2 ))^(1⁄2) 〗

d. θ=sin^(-1)⁡〖((2gT^2)/(π^2 R))^(1⁄2) 〗

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 R2, the mutual inductance M between them will be directly proportional to: a. R_1/R_2

b. R_2/R_1

c. 〖R_1〗^2/R_2

d. 〖R_2〗^2/R_1

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is 'K' times 'MR2'. Then the value of 'K' is : a. 3/4

b. 7/8

c. 1/4

d. 1/8

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side 'a'. (ii) a square of side 'a'. The magnetic dipole moments of the coil in each case respectively are: a. √3 Ia^2 and 3Ia^2 b. 3Ia^2 and Ia^2 c. 3Ia^2 and 4Ia^2 d. 4Ia^2 and 3Ia^2

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A series LCR circuit containing 5.0 H inductor, 80µF capacitor and 40Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be : a. 25 rad/s and 75 rad/s b. 50 rad/s and 25 rad/s c. 42 rad/s and 58 rad/s d. 46 rad/s and 54 rad/s

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Twenty-seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop. a. 660 V

b. 1320 V

c. 1520 V

d. 1980 V

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A particle of mass 'm' is projected with a velocity v = kVe(k 1) from the surface of the earth. (Ve=escape velocity). The maximum height above the surface reached by the particle is : a. R(k/(1-k))^2

b. R(k/(1+k))^2

c. (R^2 k)/(1+k)

d. Rk^2/(1-k^2 )

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

In the product F ⃗=q(v ⃗×B ⃗ )=qv ⃗(Bi ̂+Bj ̂+Bk ̂ ) for q=1 and v ⃗=2i ̂+4j ̂+6k ̂ and F ⃗=4i ̂-20j ̂+12k ̂. What will be the complete expression for B ⃗ ? a. -8i ̂-8j ̂-6k ̂

b. -6i ̂-6j ̂-8k ̂

c. 8i ̂+8j ̂-6k ̂

d. 6i ̂+6j ̂-8k ̂

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio i_3/i_1 of currents in terms of resistances used in the circuit is : a. r_1/(r_2+r_3 )

b. r_2/(r_2+r_3 )

c. r_1/(r_1+r_2 )

d. r_2/(r_1+r_3 )

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A step-down transformer connected to an ac mains supply of 220 V is made to operate at 11V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ? a. 0.2 A

b. 0.4 A

c. 2 A

d. 4 A

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of : a. 20 cm from the lens, it would be a real image. b. 30 cm from the lens, it would be a real image. c. 30 cm from the plane mirror, it would be a virtual image. d. 20 cm from the plane mirror, it would be a virtual image.

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended from the rod at 20 cm and another unknown mass 'm' is suspended from the rod at 160 cm mark as shown in the figure. Find the value of 'm' such that the rod is in equilibrium. (g=10m/s2) a. 1/2 kg

b. 1/3 kg

c. 1/6 kg

d. 1/12 kg

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g = 10 m/s2) nearly : a. 0 kg m/s

b. 4.2 kg m/s

c. 2.1 kg m/s

d. 1.4 kg m/s

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y ? a. b. c. d.

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A car starts from rest and accelerates at 5 m/s2. At t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s ? (Take g = 10 m/s2) a. 20 m/s, 5 m/s2

b. 20 m/s, 0

c. 20√2 m/s, 0

d. 20√2 m/s, 10 m/s2

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s2)

a. 10.2 kW

b. 8.1 kW

c. 12.3 kW

d. 7.0 kW

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of : a. [M2] [L–1] [T0]

b. [M] [L–1] [T–1]

c. [M] [L0] [T0]

d. [M2] [L–2] [T–1]

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Consider the following statements (A) and (B) and identify the correct answer. (A) A Zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V. a. (A) and (B) both are correct. b. (A) and (B) both are incorrect. c. (A) is correct and (B) is incorrect. d. (A) is incorrect but (B) is correct.

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A parallel plate capacitor has a uniform electric field E ⃗ in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is : (ε_0=permittivity of free space) a. 〖1/2 ε〗_0 E^2

b. ε_0 EAd

c. 〖1/2 ε〗_0 E^2 Ad

d. (E^2 Ad)/ε_0

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is d/2, then the viscous force acting on the ball will be : a. Mg/2

b. Mg

c. 3Mg/2

d. 2Mg

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs? a. 60 cm

b. 21.6 cm

c. 64 cm

d. 62 cm

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The escape velocity from the Earth's surface is V. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is: a. V

b. 2V

c. 3V

d. 4V

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively? a. j ̂+k ̂,j ̂+k ̂

b. -j ̂+k ̂,-j ̂-k ̂

c. j ̂+k ̂,-j ̂-k ̂

d. -j ̂+k ̂,-j ̂+k ̂

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is : a. 0.0628 S

b. 6.28 s

c. 3.14 s

d. 0.628 s

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres σ_1/σ_2is: a. R_1/R_2

b. R_2/R_1

c. √(R_1/R_2 )

d. (R_1/R_2 )^2

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since : a. a large aperture contributes to the quality and visibility of the images. b. a large area of the objective ensures better light gathering power. c. a large aperture provides a better resolution. d. all of the above.

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The equivalent capacitance of the combination shown in the figure is : a. 3 C

b. 2 C

c. C/2

d. 3C/2

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is : a. 0.52 cm

b. 0.026 cm

c. 0.26 cm

d. 0.052 cm

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the Binding Energy in the process is : a. 0.9 MeV

b. 9.4 MeV

c. 804 MeV

d. 216 MeV

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n–1 to t = n. Then, the ratio S_n/S_(n+1) is : a. (2n-1)/2n

b. (2n-1)/(2n+1)

c. (2n+1)/(2n-1)

d. 2n/(2n-1)

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy. a. [F] [A] [T]

b. [F] [A] [T2]

c. [F] [A] [T–1]

d. [F] [A–1] [T]

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

An infinitely long straight conductor carries a current of 5 A as shown. An electron is moving with a speed of 105 m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant. a. 4×10^(-20 ) N

b. 8π×10^(-20 ) N

c. 4π×10^(-20 ) N

d. 8×10^(-20 ) N

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is :- a. N

b. 2n

c. 3n

d. 4n

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10–3 watt will be : (h = 6.6×10–34 Js) a. 1018

b. 1017

c. 1016

d. 1015

 Answer ▽ 

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is : a. 13/10 t

b. 13/5 t

c. 10/13 t

d. 5/13 t

 Answer ▽ 

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be : a. 1/2

b. 1/(2√2)

c. 2/3

d. 2/(3√2)

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively : a. S/4,3gS/2 b. S/4,√3gS/2

c. S/2,√3gS/2

d. S/4,√(3gS/2)

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25Ω. What will be the effective resistance if they are connected in series ? a. 0.25Ω

b. 0.5Ω

c. 1Ω

d. 4Ω

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Question:   From NCERT NEET 2021 PYQs with detailed solution and NCERT Reference  Special Ediition @organised notes 

An electromagnetic wave of wavelength 'λ' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength λ_d , then : a. λ=(2m/hc) λ_d^2

b. λ_d=(2m/hc) λ^2

c. λ=(2mc/h) λ_d^2

d. λ=(2h/mc) λ_d^2

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Question:   From NCERT NEET  Derived PYQ 

A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be :- a. 25 b. 15 c. 50 d. 30

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Question:   From NCERT NEET  Derived PYQ 

A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance 'r' from the axis of the cable is represented by : a. b. c. d.

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Question:   From NCERT NEET  Derived PYQ 

A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V=V_0 sinωt The displacement current between the plates of the capacitor, would then be given by : a. I_d=V_0 ωC cos⁡ωt b. I_d=V_0/ωC cos⁡ωt c. I_d=V_0/ωC sin⁡ωt d. I_d=V_0 ωC sin⁡ωt

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Question:   From NCERT NEET  Derived PYQ 

A dipole is placed in an electric field as shown. In which direction will it move ? a. towards the left as its potential energy will increase. b. towards the right as its potential energy will decrease. c. towards the left as its potential energy will decrease. d. towards the right as its potential energy will increase.

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Question:   From NCERT NEET  Derived PYQ 

Find the value of the angle of emergence from the prism. Refractive index of the glass is √3 . a. 600 b. 300 c. 450 d. 900

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Question:   From NCERT NEET  Derived PYQ 

An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of potential difference 'V' volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCR series circuit is 10√2 A. The impedance of the circuit is :- a. 4√2 Ω b. 5/√2 Ω c. 4 Ω d. 5 Ω

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