IMPORTANCE QUESTION OF SCIENCE FOR GRADE NINE (IX):

Group A   [PHYSICS]

Q. 1a) Define 1 joule of work. What is the quantity of energy converted by 60W electric bulb in 30 second? Define power and mention two types of mechanical energy

b) Define the principle of conversation of energy.

c) On what principle does the atomic watch work? Why is it important?

d) Define deceleration and uniform motion?

e) Define fundamental units. Write two difference fundamental and derived units.

f) State Netwon’s Second law of motion and prove that F=ma. A vehicle of mass 1000 kg moving with a velocity of 25m/s is brought to rest in 5 second by applying the brakes. Find the retardation of the car.

g) Define one second in terms of solar day. Express the following into powers of 10. (i) 0.3mm into meter.

Name the fundamental units involved in the following units. (i) Newton (ii) meter per second.

h) If the diameter of a football is 300mm. find its volume in meter cube.

Q. 2a) name the types of energy possessed by the following.

i) red hot iron (ii) 100gm of glucose. (iii) Water of a river (iv) a stone of certain height above the ground. (v) Moving bus. (vi) Stretched rubber (vii) glowing bulb. (Viii) Water in dam.

b) Define refraction of light and state its laws.

c) on what factors the inertia of rest depends? What happens to the passenger standing inside a resting bus when the bus suddenly starts to move, why?

d) what do you mean by acceleration due to gravity? Calculate the amount of force necessary o produce an acceleration of 5m/s2 in a body of mass 1kg. consider the absence of  friction and any other resistance.

e)write down the advantages of simple machine. Why are the machines not 100% efficient? State the law of moments.

Q. 3a). Draw a well-labeled diagram of prism to show dispersion of light

b) why does a crystal of diamond sparkle, more than glass slab?

c) what is the relation between k, m and v where k is kinetic energy, m is mass and v means velocity?

d) If a car starting from rest is accelerated at the rate of 0.2 m/s2 , find its final velocity at the end of 1 minutes.

e) what is critical angle ? write down the condition for total internal reflection. A pencil partially immersed into water appears bending, why? Explain with the help of a heat diagram.

f) the speed of sound is 330m/s, its wave length is 3m, calculate the frequency of the sound wave. Write two difference between transverse wave an longitudinal wave.

g) write the advantages of a simple machine. What is meant by efficiency of a machine is 80%?

h) A load of 600N is raised by an effort of 200N by using a 1m long crow bar. If the load is 20 cm away from the fulcrum, what is the efficiency of the machine? State the law of moment.

Q.4a) define mirage. Mention two effects of total internal reflection.

b) ray diagram is important. Practice from the book.

c)write two forms of mechanical energy.

d) what do you mean by the dispersion of light?

e) why does a crystal of diamond sparkle more than a glass slab? Give the nature of electromagnetic wave. Completing the figure of prism is very important.

f) state Ohm’s law. Write down the factors that affect the current in the circuit. The power of a car is 48 watt. How much current will flow through it if it is connected to 3v to battery.

g) find the frequency of sound wave having the speed of 330m/s (3m is wave)

h) State the law of moment.

i) how can we increase the efficiency of a simple machine.

j)study the given table nd answer the following.

PEOPLE                                       FREQUENCIES(Khz)

A                                                      6.5

B                                                         10

C                                                        8.5

i)                    Among A,B,and C, find adult man, adult women and child with the help of their sound frequencies?

ii)                  Among A, B and C, which has the highest and lowest pitch?

I)                   What is the value of angle at the dip at the equator? Write any two properties of magnetic lines or force.

GROUP –B (CHEMISTRY)

Q.1a)  why atoms is electrically neutral? Write the valency of  C,H, O in CH4, H2O, B2O3 respectively.

b) what is valency? Why argon called inert gas?

c) completes and balance the following equations. K+_______= K2O.      _______+NaCL+H2O.

d) what is molecular formula? Give Examples.

e) Show the molecular formula of the sodium chloride and Calcium chloride by criss-cross method?

f)Define balanced chemical equation, what happens when Zinc react with hydrochloric acid? Write the chemical equation of it.

g) define electroplating. Which ions are formed when ionization occurs in the following compound? Write along with chemical reaction. I) sodium chloride. Ii) hydrochloric acid.  III) copper sulphate.

h) why sodium is more active chemical element than magnesium? Write based on their valency. Why is argon called inert gas?

i) Write the difference between ionic and covalent bonds.

Q.2a) mention types of mixture on the basis of the size of particles. How can an saturated solution be made saturated solution without adding solute?

b) what is the solubility of sugar at 600c if  4gm of sugar is left behind when 9gm of its saturated solution at that temperature is dried?

c) “ the solubility of NaCl at 20oc is 35?. What does it mean? Find the solubility of coppersulphate at 30oc if 6gm of coppersulphte is dissolved in 25gm of water to make saturated solution.

d) draw a labeled diagram of  laboratory preparation of hydrogen gas.

e) write one liquid metal found in room temperature?. How will you distinguish between metal and non-metal.

e) write two allotropes of carbon. Differentiate between organic and organic compound.

f) what is electrolysis? Write two application of  electrolysis.

G0 Define solubility? What amount of water is required to form a saturated solution of 80gm of solute at 20oc?( solubility of the solute at 20oc= 40 gram)

g) draw thw labeled diagram to show the preparation of hydrogen gas in the lab. What happens when hydrogen gas is passed through vegetable oil. Graphite conducts electrically but diamond can’t, why?

GROUP-C [BIOLOGY]

Q.1a) Define adaptation? Give three types of hydrophytes. Define binomial system of nomenclature. Write the scientific name of frog and mustard plant.

b) give one example of desert plant. Write two difference between aquatic and terrestrial animals.

c) give the importance of classification of living organism into phylum with one characteristics each. (i) algae (ii0 earth worm.

d) define the terms metamorphosis and histogenesis. Why pupa inside the cocoon should be killed before obtaining the silk.

e) classify the housefly with one character. Write two adaption feature of cactus plant. Write the criticism of lamarkisim.

f) define cell. Lysosome is called suicidal bags why? Name the tissue, which make the outer covering of the body or its organ. What is the name of the liquid connective tissue presents in the human body.

g) Why do plants in cold climate posses needle like leaves? Draw a labeled diagram of multipolar neuron:

h) name two complex tissue of plant and write the full for WBC. What are the different bones of vertebral column. Mention their location.

i) why is bone kept in acid is soft? Write the function of the following i) synovial fluid  ii) phalanges.

Q.2a) what is conjunctiva? What is the function of tear..define mutation.

b) How does “natural selection” leads to evolution of organisim.give at least two criticism of lamarkisim. Define optive nerve.

c)  Define eco-system? What are the biotic factors of eco-system. Give two examples of primary consumer.

d)differentiate between culex and anopheles mosquitoes. Why silk worms useful to us? Write one preventive measures to protect from mosquitoes.

f) draw a well- labeled diagram of silk worm. Define tissue, write the functions of xyleum and phloem. Name the types of epithelial tissue.

g) why silkworms important for us?  How is malaria transmitted by the mosquito? What preventive measures should be taken?

i)name the types of tissue found in plants. Smooth muscle are called involuntary muscles,why? Givw two difference between the plant cell and animal cell?

                              GROUP-C [ASTRONMY AND GEOLOGY]

Q.1a) what  is Ritcher scale? How tsunami occurs? Write its effects.

b) mention two causes of flood. Earth quake and volcano are called devastating disaster, why?

c)what is solar system? Differentiatebetween solar and lunar eclipse? Solar eclipse doesnot ossur in every full moon. Why?

d) draw a well labeled diagram of solar eclipse. Write the name of smallest planet of solar system. Why does the moon looks bright just before the lunar eclipse.

e)what is natural disaster/ name the instrument used to measure the magnitude of earthquake.

f)what is eclipse? Why does the distance between the earth and moon not remain equal during the whole year? What is milky way?

THE END. “ BEST OF LUCK”

 

IMPORTANT QUESTION OF SCIENCE FOR GRADE EIGHT (VIII)

                            GROUP-A [PHYSICS]

Q.1a) what is measurement? In CGS system length in cm, mass is in gm and time is in second, what unit is used in MKS and FPS?

What is derived unit? Describe the importance of measurement in our daily life.

b) Define velocity. Write its formula and unit. A car starts from rests. If the acceleration of the car becomes 4m/s2 after 10 seconds, calculate the final velocity of car.

In a wheel barrow it is easy to carry a load if the load is shifted towards the wheel barrow, write reason.

C) What is simple machine? Classify the shovel and beam balances, which are used in our daily life.

Prove p=hdg. A man takes 4 second to travel the distance of 5 meter with the mass of 50kg, find the power.

d) If a box 300kg has 150m2 area, find the pressure exerted by it on the ground.[g=10m/s2].

Convert 40ocinto Fahrenheit scale. Draw a well-labeled diagram of the refraction of light.

e) Name the types of energy possessed by the following:

f) Red hot iron (ii) 100gm of glucose. (iii) Water of a river (iv) a stone of certain height above the ground. (v) Moving bus. (vi) Stretched rubber (vii) glowing bulb. (Viii) Water in dam.

Describe an experiment to show that sound wave cannot travel through vaccum. Define echo and reveration?

g) Ray diagram is very important, different cross question will ask. Practice from the book.

Draw a neat and clean-labeled diagram of dry cell and simple cell.

h) Write down the arrangement of molecules in magnet and magnetic substance with figure.

A body has mass of 500 kg and the area occupied by its surface on the table is 25m2. What is the pressure exerted by the body on the table.

What are the two defects of simple cell? How are they removed/. A man of 60kg climbs 30metres tall ladder in 2 minutes, what will be the power of the man?

I) write two difference between work and power. Differentiate between the parallel and series connection.

What is simple machine and MKS system. Give the example for first and second class lever.

j) what is echo? Why does a louder sound heared in empty room than room with other material?

What is refraction of light? The image formed by a plane mirror cannot be fallen on the screen. Why?

k) if two cars ‘A’ and ‘B’ move with 10m/s and 15m/s velocity in east and west respectively then,( i) what is their relative velocity,  (ii) what will be the distance between them after two seconds?

What are the factor on which liquid pressure depend? Which place of the earth possess the maximum atmospheric pressure.

l) Draw a well labeled diagram of the parallel and series combination of cells. Write the importance function and their difference between.

What is polarization? Dry- cell is free from polarization, why?

m) What is pressure? What is it’s Si unit?. Explain about the air contains pressure with the help of figure on the basis of following things.  (i) materials    (ii) method   (iii) conclusion

 

GROUP-B [CHEMISTRY]

Q.1a) What is atom? Write down the atomic number and the symbol of helium.

Write two difference between acid and base. What is centrifugation?

b) What is crystallization? How can we separate the mixture of  (i)red ink and blue ink.  (ii) butter from milk.

Write the process to separate the following mixture.  (i) red and blue ink, alcohol and water, (iii)rice and sand.  (iv) camphor and sand.

c) Make a chart to show the effect of hydrochloric acid and hydroxide on indicators.

What is 2n2 rule? Explain with one example. How does rusting occur.

d) What is air? Show the composition of air in percentage and explain an experiment to prove that air contains water vapors.

Describe the experiment with a neat diagram to prove that “air contains water vapour”

GROUP-C [BIOLOGY]

Q.1a) Draw the well-labeled diagram of the plant cell, animal cells and amoeba.

What is photosynthesis? Explain with neat diagram the experiment to show that oxygen is evolved during photosynthesis.

b) Write two characteristics of butterfly and snail. What is circulatory system?

What do you mean by the pollination and fertilization? Write two difference between algae and Fungi.

C) Give the two function of blood circulation in human body. Define metabolisms. Write one dufference between internal and external respiration.

Mentions the name of phylum of the following animals with one symptoms.  (i) Octopus  (ii) Trypanosoma. Give two differences between arteries and vein.

d) define photosynthesis? Give the equation of this process.

Define metabolisms. ? Write the manes of enzymes that digest starch and protein.

e) Write any four organs which make enzyme in human body. What is life cycle? Draw  and label the life cycle of mustard plant with different stage ( flower , fruit, seed and plant)

What is plasma? What is the function of pericardial fluid? Write the phylum of snail and with one character of each.

 

GROUP-C [ ASTRONOMY AND GEOLOGY]

Q.1a) Write two differences between igneous and sedimentary rock. What is meant by volcanic eruption? Write any two effect of it?

Classify the following rocks:  (i) Granite  (ii) Lime stone   (iii) marble   (iv) sand stone.

b) What is constellation? Write any two differences between star and planet.

What is lava and magma? What is atmosphere? Draw the neat diagram showing the main layers of atmosphere. Write any two features of stratosphere.

c) Write down two causes of moving air. Write two reasons of air pollution. How can we control air pollution? Write any two examples.

What is sedimentary rock? Why is this rocks important to scientists.

THE END( BEST OF LUCK)

  IMPORTANCE QUSESTION OF SCIENCE FOR GRADE TEN (X)

                              GROUP-A [PHYSICS]

Q.1a) what is gravity? What is the value of acceleration due to gravity at the equatorial region of the earth? Write in SI unit. Calculate the force of gravitation between the earth and man having mass 80kg, if the mass of the earth is 6 x 1024 kg and radius of the earth is 6.38 x106m.

What is thermonuclear fusion reaction? Write any two points to justify that urbanization brings energy crisis. What is fossils fuel?

b) Give any two examples of non-renewable source of energy. Write two causes that Nepal government has given higher priority for the production of electricity.

The probability of getting hurt is more when a man jumps from a significant height, why? The mass of the earth is 6 x 1024kg and its radius is 6400 km what is the mass of a man weighing 977  newton in a spring balance0?( universal gravitation constant is 6.67 x107 Nm2/kg2 and use all the data given in the question.)

c) State the Pascal’s law. Name an instrument, which depend on it. What will be the pressure exerted at the depth of 6m in a pond, where the acceleration due to gravity is9.8m/s2? ( Density of water is1000 kg/m3)

The numerical of piston is very important. Practice from the book. “ liquid transmitted the pressure equally in all direction.” Which law does this statement represent? Speed of flow of water from tap os upper floors is less than that from the tap of down floor, why?

d) Write two differences between density and relative density. A ship coming from sea enters the river, will its hull sinks more or less in river water. Give reason.

Define heat and write its SI unit. What is the specific heat capacity of water if 2.1 x 105 joule of heat energy is required for 2kg of water to raise the temperatures from 25oc to 50oc.?

e) What is meant by one calorie? Write two reasons for using the mercury as thermometric liquid. Pooja neds 15kg of water at 38oc to take the bath, but her water was only 20oc. Calculate the minimum amount of heat energy she requires to heat the water.

If lighting candle is placed at the distance of 4cm from a convex lens having the focal length of 2cm, draw a ray diagram to show the formation of image. Calculate the magnification of lens.

f) Completing the ray diagram is very important. Practice lot from book.

What is heating element? Which heating element is used in a heater/ write any two differences between filament lamp and fluorescent lamp.

g) Which type of combination of bulb is used in the domestic electric circuit? Draw the diagram of the electroplating of copper on iron nail and show anode, cathode and electrolyte in the diagram.

Figure of transformer is very important. In exam figure will given and cross question will ask. Practice from book about the transformer. One numerical will asked. In your book there are several question and answer about it.

h) Write the relationship between induced electromotive force and rate of change magnetic flux in an electric circuit. In a house 10 CFL of 20 Watt glow for 6 hours daily, then calculate how much energy is consumed in month.

State Archimedes principle. An iron sinks in water but ship made of iron doesn’t sink , why?

 

GROUP-B [CHEMISTRY]

Q.1a) write the name of group, in which very active metals and very non-metals are placed in modern periodic table. Write the balanced chemical equation for the chemical reaction between any one of the active metal non-metal. Give the one information, which can be obtained from balanced chemical equation.

Write the name with structural formula of the substance formed due to the displacement of three hydrogen atoms of propane with three hydroxyl (OH) radicals by chemical reactions.

b) Lab preparation of ammonia, carbon dioxide is very important. Practice from book. Cross question will ask from this chapter.

In which group of the modern periodic table are there very active metals and very active non- metals/ clarify the relation between the size of the atoms of these metals and non- metals with their chemical reactivity. Write the formula equation for the chemical reaction between any one of very active non-metals. What type of chemical reaction is it?

c) What is salt? Which metal is obtained from the ore hematite? Mention its atomic weight. Write the balanced equation for the reaction between dilute sulfuric acid and that metal. Write its one use also.

Which metal is obtained from the baucxite? Write the balanced chemicals equation for the reaction between dilute hydrochloric acid and that metal. Which compound is formed this relation?

d) Write the name of two chemicals fertilizer, which provide potassium to the plant. Which chemical is used to prepare red glass? Write two differences between soap and detergent.

Why is nitrogen necessary for the plants? Name chemicals fertilizers that supplies nitrogen in the soil. Write the name of two raw materials required for the preparation of soap. Write any two differences between thermosetting plastic and thermoplastics.

 

GROUP-C [BIOLOGY]

Q.1a)  what is taxis why pituitary gland is called “master gland”? Give an example of each of phototropism and hydrotropism.

What is troposim? Why hormone known as chemical messenger? When a pin is suddenly pricked in hot foot, how does the transfer of stimulus take place? Explain it.

b) Write the name of two vitamins found in virus. The wall of artery is made of thick muscles, wh? What do you mean by heart beat? Under what condition heart beat is increased?

Which cell of the human blood does HIV affects? Draw a diagram of heart showing the blood circulation in human body? If a person has blood pressure 140/ 100mm Hg, what does it mean? Write briefly.

c) What is meiosis cell division. Differentiate between the meiosis cell division and mitosis cell division. Figure will given,, you should give the answer of given question from figure. Practice from your book.

Write two importance and significant of mitosis and meiosis cell division.

d) Which stages in life cycle of fern are called saprophyte and gametophyte? Give with reasons. Draw a labeled diagram of mushroom.

Both the asexual and sexual reproduction is necessary to complete life cycle of fern plant, clarify it. What is secondary mycelium in the cycle of mushroom?

e) what is nitrogen fixation? Write one main characteristics of following living beings:  (i) pinus (ii) lizard  (iii) Whale.  (iv) snake    (v) human beings.

What is food chain/ Describe the consequences that occur if all the tigers are killed in that food chain. Also, classify the maize plant with a special characteristic of it

Maize plant————  deer——— tigers.

f) State Mendel’s law of independent assortment. Draw a chart to show the types of offspring’s produced in F1 and F2 generations after the cross fertilization between pea plant with red(domain) and white(recessive) flowers. Write the phenotypic ratio in F2 generation also.

What is mutation? Draw a chart to show both phenotype and genotype structure of the result obtainrd in the first and second filial generation of offspring of mouse, having black colour and white colour, according to Mendel’s experiment result.

 

GROUP- D [ ASTRONOMY AND GEOLOGY]

Q.1a) what is fossils? Write the name of eras in which man and dinosaur were evolved. Write two effects produced due to depletion of ozone layers.

Living beings re evolved after millions of years of the formation of the earth, why? Write any two effects of the increasingquantity of green house gases in the atmosphere. Also give ots reasons.

b) Differentiate meteors and meteorite on two points. The tail of comet is increased as it approaches near to the sun, why?

Mentions any three reasons of launching artificial in to the space . why do some stars look much brighter in aclear sky at night?

 

THE END (BEST OF LUCK)