# 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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