Bsc I sem : Physics paper 2 : Unit 3 : Time Varying Fields

Class - BSc I sem

Sub. - Physics - Paper 2

Max. Marks - 20        Time - 1:30 Hr.

Q1 State and Explain Faraday's Law and Lenz's law of EM induction (2) Q2 State and Explain Kirchoff's voltage and current Laws.        (3)      Q3. What is Quality Factor?      (2) 

Q4 Explain different Energy losses in transformer?                            (2) 

Q5The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery? (3) 

Q6  A battery of EMF 10 V and  internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor?                                 (5) 

What is the terminal voltage of the battery when the circuit is closed?

Q7 If R1 = 2Ω, R2 = 5o, R3 = 5Ω, determine the electric current flows in the circuit below.                       (3)

TEST SERIES: CHEMISTRY: Chapter 2 :Solutions

Pathak's Academy Spectrum

 Class - XII 

Sub. - Chemistry 

Max. Marks - 25 Time - 1 Hr. 

Section - A 

Q.No. 1 : Select and write the correct answer [04] 

i) The colligative property of a solution is __________ 

a) Vapour pressure b) Osmotic pressure 

c) Boiling point d) Freezing point 

ii) Concentration of solution having osmotic pressure of 0.082 atm 

at 300 k would be ________ 

a) 0.04 M b) 0.44 M c) 0.033 M d) 1 M 

iii) Phenol on reaction with conc. HNO3 gives _________ 

a) Acetic acid b) Cyclohexanol 

c) Picric acid d) p-nitrophenol 

iv) Resorcinol on distillation with Zn - dust gives _________ 

a) Cyclohexane b) Benzene 

c) Toluene d) Benzenol 

Q. 2 Answer the following. [03] 

i) Write the product 'A' of the reaction ethyl alcohol CrO3 A 

ii) Write IUPAC name of CH3-O-CH-CH3

                                                         | 

                                                         CH3

iii) What is cryoscopic constant? 

Section - B 

Attempt any Four. [4 x 2 = 8 M] 

3) How will you prepare phenol from cumene? 

4) State and explain Raoult's law for the solution containing non 

volatile solute. 

5) What is the action of CH3MgBr on Acetaldehyde? 

6) The boiling point of solution containing 2.62 g of substance 'A' of 

100 g of water is higher by 0.0150C than the boiling point of pure 

water. What is molar moss of substance 'A' [Kb = 5.12 Km-1]

X CBSE MATHS CHAPTER 1 REAL NUMBER

 Q1. Express each number as a product of its prime factors:                                         (12) 

(i) 144

(ii) 7429

(iii) 3825

(iv) 5005

(v) 156

(vi) 81

Q2. Find the LCM and HCF of the following integers by the prime factorisation method.  (9) 

(i) 12, 15 and 21

(ii) 17, 23 and 29

(iii) 8, 9 and 25

Q3. Prove that √5 is irrational           (3) 

Q4. Prove that 3+√2 is irrational      (3) 

Q5. Given that HCF (306, 657) = 9 ,

 Find LCM (306, 657)                          (3) 

Paper on Unit II Bsc HSc II sem

 Time :  20 min   Marks : 10

Q1 a) State the nature of light as Electromagnetic wave.    (2) 

b)  Write the equation for the relationship between velocity and wavelength    (3) 

c)  If the velocity of light is 3 X 10^8 m/s,and it's wavelength is 450 nm then calculate the Frequency if light. (3) 

                       OR

Q1)  a) The laws of reflection.    (2) 

b ) Explain snell's law with suitable diagram. (3) 

c) If the angle of incidence is 40° and angle if refraction is 30° then Calculate the refractive index. (3) 

Q2 Write any four good and bad conductors of electricity. (2) 

Paper on Unit I Bsc HSc II sem

 Time :  20 min   Marks : 10

Q1 a) State Ohm's Law with mathematical equation.    (2) 

b)  Write the expression for equivalent resistance when they are connected in parallel         (3) 

c)  If three resistances are connected in parallel each of value 3 ohm, then calculate the Equivalent resistance. (3) 

                       OR

Q1)  a) Define electric charge and electric field.    (2) 

b) What is Electric current and Potential difference give relation between them. (3) 

c) If 2mA current is flowing in ckt having Potential difference between the resistance is  5v calculate the resistance connected in ckt (3) 

Q2 Write any four good and bad conductors of electricity. (2) 

ICSE Science paper (30M)

 ICSE Science paper

Marks : 30M       Time : 60 Min

Q1 Fill in the blanks (7M) 

1) When the area on which the force is applied is less, then the pressure will be.... 

2) ..... Is the tendency of force to produce rotation. 

3) Liquid pressure...... with height. 

4) On the top of Mount Everest, atmospheric pressure is..... 

5) The sound produced by the body are.... 

6) The largest artery in the body is.... 

7) .... Pumps blood to the lungs. 

Q2 Lable the diagram (3M) 

Q3 Give reasons (4M) 

a) Sound wave can't pass through Vaccume

b) Lightning ⚡ occurs first then thundering

c) O blood group is Universal donor. 

d) Sudden death occurs in cardiac arrest. 

Q4 Differentiate the following (4M) 

a) Arteries and Veins

b) longitudinal wave and transverse wave

Q5 Match the following (4M) 

Q6 Complete the following reactions (7M) 

Q7  Write A short note on Pressure(1M) 

Homescience: Sem 2 : Unit 3

Important Definations on Lenses:

 Pole

The centre of the spherical refracting surface of the lens is called the pole. The point where the principal axis meets the surface of the lens.

Optical Centre

Optical centre is the point on the principal axis at the centre of the lens.

Centre of Curvature  When two spherical surfaces forms a part of a sphere. The centre of these spheres is known as the centre of curvature.

Principal axis

 An imaginary line passing through the centres of curvature and the pole is called its principal axis

Aperture

The area of the lens suitable for refraction is called Aperture. The aperture of the lens is the effective diameter of its light-transmitting area.

Focus

Focus is the point onto which collimated light parallel to the axis is focused.

Focal length

The focal length is the distance between the optical centre and the focal point or focus of the lens

Power 

The power of the lens is the reciprocal of its focal length. The S.I unit of power is Dioptre.

 

Question Bank as per boards: 30 marks: : 12th: Modern Physics

Pathak's Academy Spectrum

Topics:Modern Physics

1. Dual nature of particle 2. Structure of atom and nuclei 3. Semiconductor devices

Marks: 30                                                          Time: 1h 10 min 

Section - A

Q.No. 1 : Select and write the correct answer (any 6) [06]

i) A photocell is used to automatically switch on the street lights in the evening 

when the sunlight is low in intensity. Thus it has to work with visible light. The 

material of the cathode of the photocell is

 (A) zinc (B) aluminum 

 (C) nickel (D) potassium

ii) An electron, a proton, an α-particle and a hydrogen atom are moving with the same 

kinetic energy. The associated de Broglie wavelength will be longest for

 (A) electron (B) proton 

 (C) α-particle (D) hydrogen atom

iii) In which of the following systems will the radius of the first orbit of the electron

be smallest?

(A) hydrogen (B) singly ionized helium

(C) deuteron (D) tritium

iv) The radius of the 4th orbit of the electron will be smaller than its 8th orbit by a

factor of

(A) 2 (B) 4

(C) 8 (D) 16

v) In a BJT, largest current flow occurs 

 (A) in the emitter 

 (B) in the collector 

 (C) in the base 

 (D) through CB junction

vi) Solar cell operates on the principle of: 

 (A) diffusion

 (B) recombination

 (C) photovoltaic action

 (D) carrier flow

vii) A logic gate is an electronic circuit which: 

 (A) makes logical decisions

 (B) allows electron flow only in one 

 direction

 (C) works using binary algebra

 (D) alternates between 0 and 1 value

Q. 2 Answer the following. [04]

i) State any two postulates of Bohr’s atomic model.

ii) On which factors does the wavelength of light emitted by a LED depends?

iii) Write the Boolean expression for (i) OR gate, (ii) AND gate

iv) What is photoelectric effect?

Section - B

Attempt any Four. [5 x 2 = 10 M]

i) Explain what you understand by the de Broglie wavelength of an electron. 

ii) State the principle and any two uses of a solar Cell. 

iii) What do you understand by the term wave-particle duality? 

iv) Draw the diagram of hydrogen spectrum.

v) Explain the forward and the reverse characteristic of a pn junction diode.

vi) Draw the circuit diagram for common Emitter amplifier using npn transistor.

Section - C

Attempt any Two. [3 x 2 = 6 M]

i) Draw the circuit diagram of a half wave rectifier. Explain its working. What is the frequency of ripple in its output?

ii) Starting from the formula for energy of an electron in the nth orbit of hydrogen atom, derive the formula for the wavelengths of Lyman and Balmer series spectral lines.

iii) What is the speed of a proton having de Broglie wavelength of 0.08 Å?

Section - D

Attempt any One. [1 x 4 = 4 M]

i) What is logic gate? Write down the truth table and Boolean expression for ‘NAND’ gate.What are the uses of logic gates? Why is a NOT gate known as an inverter?

ii) Show that the frequency of the first line in Lyman series is equal to the difference

between the limiting frequencies of Lyman and Balmer series.

Class 12 : Chapter 10 : Vector Algebra

 Q1 : Solve the following (3 marks each) (Solve any five)

1.  Vectors find the area of triangle RST, whose vertices are R(2, 2, 3), S(2, -2, 4) and T(4, 5, -1).
2. Use vector method to show that P,Q,R are Collinear – P(3, -5, 1), Q(-1, 0, 8) and R(7, -10, -6)
3. Find the angles between the lines whose direction ratios are 3, 2, -6 and 1, 2, 2. Find the angles of a triangle ABC whose vertices are A(-1, 3, 2), B(2, 3, 5) and C(3, 5, -2).
4. Prove that the points A(-2, 4, 7), B(3, -6, -8) and C(1,-2,-2) are collinear.
5. Find the angle between the lines whose direction ratios are: 2, -3, 4 and 1, 2, 1.
6. Using vectors, find the value of k such that the points (k, – 10, 3), (1, –1, 3) and (3, 5, 3) are collinear.

 Q2: Find the unit vector in the direction of the sum of the vectors (2)

a = 3i-j-3k

b = 2i-j-2k

Q 3: Find the vector joining the points A(2, -3, 0) and Q(– 1, – 2, 1) directed from A to B.(3)