ICSE | CLASS 10 CHEMISTRY | CHAPTER 5 ELECTROLYSIS | MCQs | Semester 1 || 2021

ICSE | CLASS 10 CHEMISTRY | CHAPTER 5 ELECTROLYSIS | MCQs | Semester 1 || 2021

1 Electrolysis is the passage _____ of liquid or a solution accompanied by a______ change.
2 A weak electrolyte is one which (a) dissociates completely (b) is feebly ionised in the solution (c) ionises completely (d) is having high electrical conductivity
3. A strong electrolyte is one which (a) is completely ionised in the solution (b) dissociates partially in solution (c) is having low electrical conductivity (d) Ionises partially
4. Sodium chloride is(a) strong electrolyte (b (c) non-electrolyte (d) weak electrolyte ) None of these
5. Water is (a) strong electrolyte (c) weak electrolyte (b) non-electrolyte (d) None of these
6. Pure water consists almost entirely of (a) ions (b) atoms(c) ions and molecules (d) molecules
7. In the electrolysis of acidulated water, oxygen is produced by the discharge of...............ions at the anode.
8. The gas given off at cathode during the electrolysis of acidulated water is................
9. With platinum electrodes, hydrogen is liberated at the ............ and oxygen at the............ during the electrolysis of acidified water.
10. The electrode where the current enters the electrolyte is called the...........
11. During electrolysis, anions undergo_______at the _______

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ICSE | CLASS 10 CHEMISTRY | CHAPTER 2 CHEMICAL BONDING| MCQs | Semester 1 || 2021 1.

1. A reducing agent is a substance which can (a) Accept electron (b) Donate electrons (c) Accept protons (d) Donate protons

2. In NH^+4 all the four bonds are.....

3. Among the following compounds identify the compound that has all three bonds (ionic, covalent and coordinate bond) (a) Ammonia (b) Ammonium chloride (C) Sodium hydroxide (d) Calcium chloride

4. Due to the presence of strong electrostatic forces of attraction between ions, ionic compounds. (a) Have high melting and boiling points (b) Conduct electricity in solid state (C) Dissolve in kerosene (d) All of the above

5. Ionic bond is present in which of the following species:(b) CHC13 (C) NaBr (d) CCl4 (a) O2

6. The type of bonding in HCl molecule is: (a) Polar covalent bond (b) Pure covalent (C) Non-polar(d) Hydrogen bonding

7. A polar covalent bond will be formed in which one of these pair of atoms:b) H2 (C) Cl2 (d) 02 (a) HF

8. Which of the following is a common characteristic of a covalent compound ? (a) high melting point (b) consists of molecules (c) always soluble in water (d) conducts electricity when it is in the molten state

9. Elements which gains electrons is known as: (a) Electropositive elements (b) Electronegative elements

10. Capacity of an atom to attract the shared pair of electron to itself is called......

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OXIDATION NUMBERS - PRACTICE PROBLEMS

Calculate the oxidation number of underlined atoms. a. H2SO4 b. HNO3 c. H3PO3 d. K2C2O4

e. H2S4O6 f. Cr2O7(-2) g. NaH2PO4

Maharashtra Board Chapter 6 Class 11 Redox Reactions

OXIDATION NUMBERS | SOLVED EXAMPLES

Derivation of Time period T=2π√(l/g) of Simple Pendulum | What is Seconds Pendulum

In this lecture we deal with

Derivation of T=2π√l/g

finding acceleration due to gravity(g) using T=2π√l/g

why sinθ=θ for small angles

assumptions for derivation of simple pendulum formula

laws of Simple Pendulum

what is a Seconds Pendulum

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ICSE CLASS X Boards Revison MCQs with Solutions | Physics MACHINES Chapter 3 (BLOCK AND TACKLE) | 2021 Semester 1

Q1. A block and tackle system has a VR = 5. Rahul exerts a pull of 150 kgf. What is the maximum load he can raise with this pulley system if it's efficiency = 75%.

Q2. A pulley system has MA = 4. If a load of 10 kgf is pulled up a distance of 2 m in 10 s, calculate Power developed by the Effort.

Q3. The MA of a pulley is 5 and its efficiency is 80%. It is used to lift a load of 200 kgf to a height of 20m.

i) What is the Effort required?

ii) What is the VR ?

iii) What is distance moved by Effort ?

ICSE PAST PAPERS 2020 2019 2018 2017 PHY CHEM BIO MATHS

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ICSE CLASS X Boards Revison MCQs with Solutions | Physics WORK,POWER,ENERGY Chapter 2 | 2021 Semester 1

1 . A catapult throws a stone of mass 0.10 kg with a velocity of 30 m/s. If 25% of the P.E. of the elastic band is wasted during transmission, find the magnitude of the potential energy.

2. In a hydroelectric power station, 1000 kg of water is allowed to drop a height of 100 min 1 s. If the conversion of potential energy to electric energy is 60%, calculate the power output.

3. The heart of a deer chased by a tiger beats 200 times in a minute and does a work of 1.4 joules per beat. What is the power of heart?

4. An accelerated electron has energy of 9.6 * 10^(-19) J. Express energy in electron volts (eV).

ICSE CLASS X Boards Revison MCQs with Solutions | Physics Force Chapter 1 | 2021 Semester 1

PAPERSOLUTIONS

1.Calculate the force which will produce a moment of force of 1575 dyne cm, when the perpendicular distance between point of application of force and turning point is 45 cm.

2. A uniform metre scale is balanced at 60 cm mark, when weights of 5 gf and 40 gf are suspended at 10 cm mark and 80 cm mark respectively. Calculate the weight of the metre scale.

3 A uniform metre scale of weight 50 gf is balanced at the 40 cm mark, when a weight of 100 gf is suspended at the 5 cm mark. Where must a weight of 80 gf be suspended to balance the metre scale ?

4. Calculate the length of the arm of couple, if a force of 13 N produces a moment of couple of 14.3 Nm.

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SIMPLE HARMONIC MOTION - NUMERICALS - MAHARASHTRA BOARD - SOLUTIONS - CHAPTER 5 - OSCILLATIONS

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LECTURENOTES_YOUTUBE

CLASS 12 PHYSICS MAHARASHTRA BOARD CHAPTER 5 SOLUTIONS

Q1. (i) A particle performs linear S.H.M. starting from the mean position. Its amplitude is A and time period is T. At the instance when its speed is half the maximum speed, its displacement x is

(ii) A body of mass 1 kg is performing linear S.H.M. Its displacement x (cm) at t (second) is given by x = 6 sin (100t + m/4). Maximum kinetic energy of the body is

Q8. At what distance from the mean position is the speed of a particle performing S.H.M. half its maximum speed. Given path length of S.H.M. = 10 cm. [Ans: 4.33 cm]

Q9. In SI units, the differential equation of an S.H.M. d^2x—dt^2= —36x . Find its frequency and period. [Ans: 0.955 Hz, 1.05 s]

Q10. A needle of a sewing machine moves along a path of amplitude 4 cm with frequency 5 Hz. Find its acceleration (1/30) s after it has crossed the mean 30 position. [Ans: 34.2 m/s2]

Q11. Potential energy of a particle performing linear S.H.M is 0.1 pi^2 x^2 joule. If mass of the particle is 20 g, find the frequency of S.H.M. [Ans: 1.581 Hz]

Q12. The total energy of a body of mass 2 kg performing S.H.M. is 40 J. Find its speed while crossing the centre of the path. [Ans: 6.324 cm/s]

13. A simple pendulum performs S.H.M of period 4 seconds. How much time after crossing the mean position, will the displacement of the bob be one third of its amplitude. [Ans: 0.2163 s]

14. A simple pendulum of length 100 cm performs S.H.M. Find the restoring force acting on its bob of mass 50 g when the displacement from the mean position is 3 cm. [Ans: 1.48 x 10-2N]

15. Find the change in length of a second's pendulum, if the acceleration due to gravity at the place changes from 9.75 m/s2 to 9.8 m/s2. [Ans: Decreases by 0.0051 m]

16. At what distance from the mean position is the kinetic energy of a particle performing S.H.M. of amplitude 8 cm, three times its potential energy? [Ans: 4 cm]

17. A particle performing linear S.H.M. of period 27π seconds about the mean position 0 is observed to have a speed of b SQRT(3) m/ s, when at a distance b (metre) from 0. If the particle is moving away from 0 at that instant, find the time required by the particle, to travel a further distance b. [Ans: π/3 s]

18. The period of oscillation of a body of mass m1 suspended from a light spring is T. Whcn a body of mass m2 is tiEd to the first body and the system is made to oscillate, the period is 2T. Compare the masses m1 and m, [Ans: 1/3]

Q19. The displacement of an oscillating particle is given by x = asincot +bcoscot where a, b and w are constants. Prove that the particle performs a linear S.H.M. with amplitude A=sq root (a^2 +b^2)

Q20. Two parallel S.H.M.s represented by xi = 5sin (47 pi t + pi/3) cm and x2 = 3sin (4 pi t + pi/4) cm are superposed on a particle. Determine the amplitude and epoch of the resultant S.H.M. [Ans: 7.936 cm, 54° 23']

21. A 20 cm wide thin circular disc of mass 200 g is suspended to a rigid support from a thin metallic string. By holding the rim of the disc, the string is twisted through 60° and released. It now performs angular oscillations of period 1 second. Calculate the maximum restoring torque generated in the string under undamped conditions. [Ans: 0.04133 N m]

22. Find the number of oscillations performed per minute by a magnet is vibrating in the plane of a uniform field of 1.6 x 10-5 Wb/m^2. The magnet has moment of inertia 3 x 10^-6 kg/m2 and magnetic moment 3 A m^2. [Ans:38.19 osc/min.] ^

23. A wooden block of mass m is kept on a piston that can perform vertical vibrations of adjustable frequency and amplitude. During vibrations, we don't want the block to leave the contact with the piston. How much maximum frequency is possible if the amplitude of vibrations is restricted to 25 cm? In this case, how much is the energy per unit mass of the block? [Ans: nmax = 1/s, E/m = 1.25 J/kg]

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Congruent Triangles | Class 7, Class 8 Class 9 | CBSE ICSE IGCSE

Congruent Triangles | Class 7, Class 8 | CBSE ICSE IGCSE

LINKNOTES

CLASS9_NCERT_CHAPTER7

CLASS8_NCERT_CHAPTER7

Below topics are covered in this lecture: 00:00 What is Congruency? 07:50 Rules of Congruency 12:40 Altitude, Perpendicular 15:30 Median 16:42 Angle Bisector 18:10 Side bisectors 18:45 Isoceles triangle 19:14 Scalene triangle 19:48 Right Triangle 21:00 SSS 29:10 SAS 35:50 ASA 38:45 Ex7.2solutions 51:07 RHS

---------------------

Ex 7.2 Class 9 Maths

Question 1. In an isosceles triangle ABC, with AB = AC, the bisectors of ∠B and ∠C intersect each other at 0. Join A to 0. Show that (i) OB = OC (ii) AO bisects ∠A

Ex 7.2 Class 9 Maths Question 2. In ∆ABC, AD is the perpendicular bisector of BC (see figure). Show that ∆ ABC is an isosceles triangle in which AB = AC.

Ex 7.2 Class 9 Maths Question 3. ABC is an isosceles triangle in which altitudes BE and CF are drawn to equal sides AC and AB respectively (see figure). Show that these altitudes are equal.

Ex 7.2 Class 9 Maths Question 5. ABC and DBC are isosceles triangles on the same base BC (see figure). Show that ∠ ABD = ∠ACD.

--------------------

Class 9 NCERT Solutions- Chapter 7 Triangles – Exercise 7.1
Question 1. In quadrilateral ACBD AC = AD and AB bisects ∠ A (see Fig. 7.16). Show that ∆ ABC ≅ ∆ ABD What can you say about BC and BD?
Question 3. AD and BC are equal perpendiculars to a line segment AB (see Fig. 7.18). Show that CD bisects AB.
Question 2. ABCD is a quadrilateral in which AD = BC and ∠ DAB = ∠ CBA (see Fig. 7.17). Prove that
(i) ∆ ABD ≅ ∆ BAC
(ii) BD = AC
(iii) ∠ ABD = ∠ BAC.

------------------------------

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Simple Harmonic Motion | Derivations of x,v,a

Below topics have been covered in this lecture: Conditions for Linear SHM, Simple Harmonic Motion Key Terms, Mean Position, Amplitude in SHM, Time Period and Frequency of SHM, Phase in SHM, Phase Difference, Simple Harmonic Motion Equation and its Solution, Solutions of Differential Equations of SHM, Quantitative Analysis of SHM, Velocity of a particle executing Simple Harmonic Motion, Kinetic Energy of a Particle in SHM, SHM as a Projection of Circular Motion

x=displacement from mean positions, v=veleocity at position x, a=acceleration at position x, ϕ- initial phase angle, w=angular frequency, k=spring constant, A=amplitude

TIMESTAMP 00:00 overview (x,v,a, KE,PE, TE) 03:58 k-Spring Constant 05:06 equations overview 05:53 w,T,f discussion 11:52 how to study SHM 13:15 definition of SHM 18:47 derivation starts 23:45 Mean and Extreme values 27:45 v^2=w^2(a^2-x^2) 33:14 x=Asin(ωt+ϕ) calculations 35:00 ϕ discussion 47:14 v=Awcos(wt+ϕ) calculations 48:30 a=-Aw^2sin(ωt+ϕ) calculations 49:10 T calculations

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A spherical water balloon is revolving at 60 rpm. In the course of time, 48.8 % of its water leaks out. With what frequency will the remaining balloon revolve now?

Q5. A ballet dancer spins about a vertical axis at 90 rpm with arms outstretched. With the arms folded, the moment of inertia about the same axis of rotation changes to 75%. Calculate the new speed of rotation.

Q9. Two wheels of moment of inertia 4 kgm2 rotate side by side at the rate of 120 rev/min and 240 rev/min respectively in the opposite directions. Iff now both the wheels are coupled by means of weightless shaft so that both the wheels now rotate with a common angular speed, Find the new speed of rotation

Q10. A uniform circular disc with its plane horizontal is rotating about a vertical axis passing through its centre at a speed of 180 r.p.m. A small piece of wax of mass. 1.9 g falls vertically on the disc and sticks to it at a distance of 25 cm from the axis. If the speed of rotation is now reduced by 60 r.p.m., calculate moment of inertia of the disc.

Q12. A homogeneous rod XY of length L and mass `M' is pivoted at the centre 'C' such that it can rotate freely in vertical plane. Initially the rod is in the horizontal position. A blob of wax of same mass 'M' as that of the rod falls vertically with the speed 'V' and sticks to the rod midway between points C and Y. If the rod rotates with angular speed 'w' what will be angular speed in terms of V and L ?

Q20. A big dumb-bell is prepared by using a uniform rod of mass 60g and length 20cm. Two identical solid spheres of mass 50g and radius 10cm each are at the two ends of the rod. Calculate the moment of about an axis passing through its center and perpendicular to the length.

Q21. A flywheel used to prepare earthenware pots is set into rotation at 100 rpm. It is in the form of a disc of mass 10 kg and radius 0.4 m. A lump of clay (to be taken equivalent to a particle) of mass 1.6 kg falls on it and adheres to it at a certain distance x from the centre. Calculate x if the wheel now rotates at 80 rpm.

CHEMICAL BONDING - IONIC AND COVALENT

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TIMESTAMP
00:00 Introduction
01:15 Ionic Bonding (NaCl) Sodium Chloride
08:33 Formation of MgCl2 Magnesium Chloride
13:54 Formation of CaCl2 Calcium Chloride
19:42 Formation of Na2O Sodium Oxide
27:31 Covalent bonding
29:35 Formation of H2 Hydrogen gas
37:29 Formation of Cl2 Chlorine Gas
39:00 Formation of O2 Oxygen Gas
43:12 Formation of N2 Nitrogen Gas
48:57 Formation of HCl Hydrogen Chloride
50:15 Formation of CH4 Methane
51:56 Formation of NH3 Ammonia
53:16 Formation of H2O Water

Obtain an expression for relating Torque/Angular Momentum with Angular Acceleration & Moment of Inertia

Rotational Dynamics | Class 12 | Maharashtra Board

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Moment of Inertia jee 2019 solutions

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2019 JEE Mains Moment of Ineritia Solutions

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