Wednesday , 18 October 2017

# Latest Important Questions for 2015

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## Physics Long Questions Guess Paper 9th Class 2014

• A 50kg man moved 25 steps up in 20 seconds. Find his power each step is 16cm high
• A car starts from rest. Its velocity becomes 20 ms-1 in 8 s. Find its acceleration
• A car weighing 12 KM has speed of 20ms. Find its kinetic energy
• A chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area up to reasonable number of significant figures.
• A communication satellite is launched at 42000 km above Earth. Find it orbital speed.
• A container has 2.5 liters of water at 20°C. How much heat is required to boil the water?
• A man is pulling a trolley on a horizontal road with a force of 200 Newton making 30° with the road. Find horizontal and vertical components of its force
• A man pulls a block with a force of 300 N through 50 m in 60 s. Find the power used him to pull the block.
• A screw gauge has 50 divisions on its circular scale. The pitch of the screw gauge is 0.5mm. What is its least count?
• A wooden cube of sides 10cm each has been dipped completely in water. Calculate the up thrust of water acting on it
• As soon as the hot solid is put in the cold water, it reaches the maximum temperature quickly. Give a reason for this.
• At what attitude the value of g would become one fourth than to the surface of the earth?
• Calculate the power of pump which can lift 200 kg of water through a height of 6m in 10 seconds.
• Convert 50°C on Celsius scale into Fahrenheit temperature scale
• Define and explain latent heat of fusion
• Define and explain Newton’s second law of motion.
• Define centripetal force
• Define momentum. Mathematically prove the relation between force and momentum
• Define rate of flow of heat Derive the relation for thermal conductivity of a solid
• Define rotator motion. Give examples
• Define specific, heat. How would you find the specific, heat of a solid?
• Define the specific heat capacity
• Define translator motion. Also state its three types
• Derive the first equation of motion for uniformly accelerated rectilinear motion
• Describe an experiment to find the centre of gravity of an irregular shaped thin lamina
• Describe how a vector quantity is represented? Explain with examples
• Describe some practical applications force in our daily life
• Describe the importance of in daily life
• Describe the processes involved to produce energy from fossil fuels
• Determine the mass of using Newton’s law of gravitation
• Determine the orbital speed of artificial satellites
• Explain briefly the motion of freely falling bodies?
• Explain green house effect
• Explain the changes in weather due to the variation in atmosphere pressure
• Explain the working of Hydraulic press
• Find the acceleration from speed-time graph shown in figure
• Find the density of the above object by using spring balance and compare the result with that you have already found by physical balance
• Find the latent heat of fusion of ice with the help, of simple experiment
• Find the magnitude and direction of a force whose x- component is 12N and y-component is 5N
• Find the perpendicular components of a force of 50N making an angle of 30° with x-axis
• How can a hot air balloon carrying a lot of load rise in the air?
• How can the mass of Earth be determined?
• How can you find the high temperature of a metal piece of known mass and known specific heat by the method of mixture?
• How can you find the value c unknown weight by using the above apparatus and the graph you have drawn?
• How convention current in air forms land and sea breezes and also help in gliding of gliders and birds?
• How different sources of energy are harmful to environment also explain to prevent these hazards?
• How many are the types of motion Explain
• How many scales of temperature are Unique there in use?
• How many types of thermal volume expansion are? Explain
• How much heat is required to increase the temperature of 0.5 kg off water from 10°C to 65°C?
• How much ice will melt by 50000 J of heat? Latent heat of fusion office=336000 Jkg-1 (150g)
• How various surfaces can be comparing by a Leslie cube? Explain it.
• How would you find the specific heat of solid?
• If the same amount of heat is transferred to an equal mass of water and lead metal which substance will be hotter?
• Normal human body temperature I 98.6`F. Convert into Celsius and Kelvin scale
• On what factors emission and absorption of radiation depends
• On which principle Hydraulic press works? Explain the working of Hydraulic press.
• State and demonstrate Pascal’s law
• State and explain Archimedes Principle
• State and explain law of conservation of momentum
• State and explain Resolution of Forces in its rectangular components
• State and explain the secure condition for equilibrium
• State Archimedes Principle. Derive its mathematical relation
• The density of air is 1.3Kgm-3.Find the mass of air in a room measuring 8m x 5m x 4m.
• What are the consequences and applications of radiation?
• What are the factors on which rate of flow of heat depends?
• What do you know about young’s modules? How would you determine young’s modules of an object?
• What effect is expected if in instead of single cup, double cups (one into the other) are used and if the cup is covered by a lid of Styrofoam as well?
• What is a greenhouse? How does the temperature in a greenhouse can be maintained? How Green house effect is produced in nature
• What is a screw gauge? Give its construction and working.
• What is a stop watch? Write its types and give least count of each of them? Describe the method of use of stop watch
• What is centrifugal force? Explain
• What is kinetic molecular model of matter?
• What is meant by scientific notation? Explain with examples
• What is mercury barometer? Describe its construction and working
• What is plasma? How it from is formed? Give some examples?
• What is the difference between scalar and vector quantities?
• What is the importance of large specific heat capacity of water?
• What is thermal conductivity? On what factors rate of flow of heat depends upon? Explain.
• Why is polystyrene cup used in this experiment instead of a metallic calorimeter?
• Write a note on meter rule
• Write kinetic molecular model for solids, liquids and gases

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