What is motion?
Differentiate between the distance and displacement?
Write a short note on uniform motion?
Write a short note on non-uniform motion?
Draw a distance time graph for the ball falling from height?
What is acceleration and what is its unit?
Write the mathematical expression for the acceleration?
What is average speed?
What is average velocity?
differentiate between the spped and velocity?
What is uniform acceleration?
What is non-uniform acceleration?
What is retardation and what would be the retardation for the car which was moving with the velocity of 60 m/s come to rest within 20 second?
Is displacement a scalar quantity?
Change the speed of 6m/s into km/h
Derive the first equation of motion?
Derive the second equation of motion?
Derive the third equation of motion?
Draw the distance time graph for uniform speed?
Draw the distance time graph for non-uniform speed?
Draw the speed time graph for car moving with uniform acceleration?
Draw the speed time graph for the car moving with non-uniform acceleration?
Derive the first eqution of motion by graphical method?
Derive the second equation of motion by graphical method?
Derive the third equation of motion by graphical method?
Give two example of uniform circular motion?
Define work and what is its unit?
Explain the work done against the gravity?
Explain positive, negative and zero work with example?
What is energy and what its unit?
Classify the following into the scaler and vector quantity: Work, power , energy, Kinetic energy, Potential energy
Differentiate between the kinetic energy and potential energy?
Derive the formula for the kinetic energy?
If the mass of the body is doubled and velocity is increased by five times, by what times the kinetic energy of the object will increase?
Two object having equal masses are moving with the uniform velocity of 5m/s and 20m/s respectively. Calculate the ratio of their knetic energies.
A boy weighing 60 Kg makes a high jump of 2.5 m. (i) what is his kinetic energy at the highest point? (ii) what is his potential energy at the highest point?
Define power and what is its unit?
Define 1 watt?
What is the commerical unit of energy?
What is the relation between the kilowatt-Hour and joule?
Write a short note on the transformation of energy?
Explain the energy transformation at a thermal power house?
Explain law of conservation of energy by using simple pendulum?
The power output of an engine is 4.5 KW. How much work does the engine do in 20 second?
Describe the energy changes which take place in a radio?
A car weight 4900 N climbs up a hill with a man having 100 Kg at a steady speed of 8m/s gaining a height of 120 m in 100 s. Calculate (i) Total work done by the car with man (ii) Power of engine of car
Differentiate between the two types of waves?
Differentiate between the compression and rarefaction?
Draw a graphical representation of longitudinal waves?
Explain the characteristics of a sound wave?
Explain the relationship between the velocity, frequency and wavelength of wave?
If 1500 waves are produced per second, what is the frequency in hertz? what is the time period?
If the velocity of sound waves is 340 m/s, what is the audible amplitude range which we can hear?
Show experimentally to show that the sound can't travel through vaccum?
Why in cricket the ball is seen to hit the bat first and the sound of hitting is hear a little later?
Explain how the megaphone work on the principle of reflection of sound?
What is echo and what is the required condition for the echo?
What is reverberation and what are the methods used to reduce the reverberation in the big halls and the auditoriums?
What is ultrasound and mention its three applications?
Explain the SONAR?
Explain loudness, pitch and timbre of sound?
Draw a labelled diagram of the human ear?
Explain the working of human ear?
What is atom?
Explain law of conservation of mass?
Experimentally proves that every chemical reactions follow the law of conservation of mass?
Explain law of constant proportions with example?
What is Dalton's atomic theory?
What are the drawback of Dalton's atomic theory?
Explain the significance of symbol of an element?
What is atomic mass unit?
In which ways atom exists in nature and differentiate between them?
Write a short note on molecules?
What is atomicity and what is the atomicities of Oxygen, Carbon di oxide and sulphuric acid?
What is chemical formulae?
What is molecular mass and calculate the molecular mass of the washing soda, common salt , baking soda and ammonia?
What is the significane of the formula of a substance?
What is ion and how it is formed?
What are the types of ion and calculate the number of electron, proton in the following ion: sodium ion, calcium ion, chloride ion, ammonium ion
Differentiate between the simple ion and polyatomic ion?
Differentiate between the ionic and covalent compound?
Write chemical formula of four ionic compound and four covalent compound?
Workout the formula of following compound: carbon dioxide, methane, ammonia, water, carbon tetrachloride
1 mark Questions
1. Define atomic mass and molecular mass.
2. Who provided the basic theory about the nature of matter?
3. Define atomic mass unit
4. The number of atoms consisting a molecule is known as its __________
5. What is valency of an element?
6. Mass of 1 mole of substance is called its ___________
7. Avogadro number is ____________
8. A group of atoms carrying a charge is known as a ____________
9. The reciprocal of ______________ is called avogram.
10. The most abundant metal in earth's crust is __________
11. Which postulate of Dalton's atomic theory can explain the law of definite proportion?
12. Write the formula of ammonium carbonate.
13. Define an element.
14. How many atoms are present in H2S molecule and PO43- ion?
15. Define the atomic mass unit.
16. If K and L shells of an atom are full, then what would be total number of electron in an atom?
17. If the number of protons of an element is 8 and number of neutrons are also 8. Write the notation of that element.
18. What does the formula of a compound indicate?
2 marks Questions
1. State the law of conservation of mass?
2. What is the law of constant proportions?
3. What is a molecule? Give examples
4. Write the chemical formulae of (i) magnesium hydroxide (ii)Calcium Carbonate (iii) aluminum chloride (iv) Potassium Sulphate
5. What is molecular mass? How it is expressed?
6. What is the mass of;
(a) 1 mole of Potassium atoms?( K= 39u)
(b) 4 moles of aluminum atoms? (Al = 27u)
7. Define the term chemical formula?
8. If 1 mole of Sodium atoms weigh 23 grams, what is the mass (in grams) of 1 atom of Sodium?
9. What is meant by the term
(i) Chemical formula (ii) Molecular mass
10. Atomic radius is measured in ________________
11. What is the mass of
a. 0.2 mol atom of oxygen.
b. 0.5 mol molecule of water.
12. 8.4 g of magnesium carbonate on heating gave 4.4 g of carbon dioxide and 4.0 g of
magnesium oxide. Show that these observations are in agreement with the law of
conservation of mass.
13. Calculate the number of molecules in 0.01 mole of water.
14. Calculate the molar mass of the following:
(a) HNO3
(b) Na2SO3
3 marks Questions.
1. State the postulates of Dalton's atomic theory.
2. What are the laws of chemical combination?
3. Define (i) Ion (ii) anion (iii) caution (iv) polyatomic ion.
4. Calculate the relative Molecular mass of
(i) H2O (water)
(ii) H2SO4 (Sulphuric acid)
(iii) CaCO3 (Calcium Carbonate)
(given the atomic masses of H=1u, O = 16u, S = 32u, Ca = 4Ou and C = 12 u)
5. Calculate the formula unit masses of ZnCl, K2SO4, Na2O, given atomic masses of
Na=23u, Cl = 35.5u, Zn = 65 u, S=32u and O= 16u.
6. Which has more number of atoms, 100 grams of sodium or 100 grams of
iron given, atomic mass of Na = 23u, Fe = 56 u?
7. Calculate the mass of;
(i) 0.5 mole of C atoms (ii) 6.022 x 1023 number of O2 molecules.
(iii) 10 moles of (H2SO4)
8. Calculate the following:
(a) How many atoms are present in 5.60 mol of copper metal?
(b) Calculate the number of moles in 32 g of methane.
(c) Calculate the number of molecules in 90g of water.
9. Find the empirical formula of a compound containing 80% carbon and 20% hydrogen. If it has a molecular mass of 30, find its molecular formula. Calculate the number of molecules of sulphur (S8) in 16 g of solid sulphur. Find the formula mass of Na2CO3.10H2O .
10. The average atomic mass of sample of an element X is 16.2 u. What are the percentage of isotopes 8X16 and 8X18 in the sample?
11. Calculate the mass of the following in grams.
(1) .004 Mole of Neon gas (Ne = 20u)
(2) 3.76 X1021 copper atoms (Cu = 64u)
5 marks Questions
1. Calculate the number of particles in the following:
(a) 69 g of Na atoms.
(b) 56 g of He
(c) 0.1 mole of carbon
2. (a) What are the postulates of Dalton's Atomic Theory?
(b) Which postulate of Dalton's Atomic Theory is the result of the law of conservation of mass?
(c) Which postulate of Dalton's Atomic Theory can explain the law of definite proportions?
3. Solve the problems.
(1) 10.0 g CaCO3 on heating gave 4.4 g of CO2 and 5.6 g of CaO. Show that these observations are in agreement with law of conservation of mass.
(2) 1.375 g of cupric oxide was reduced by heating in current of hydrogen and the weight of copper that remained was 1.098 g. In another experiment, 1.179 g of copper was dissolved in the nitric acid and the resulting copper nitrate converted into cupric oxide by ignition. The weight of cupric oxide formed was 1.476 g. Show that these results illustrate the law of constant proportions.
What is motion?
Differentiate between the distance and displacement?
Write a short note on uniform motion?
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