Cell and Answer Type Questions

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INDIAN SCHOOL AL WADI AL KABIR
DEPARTMENT OF SCIENCE 2014-15
CLASS: IX DATE: 11 .06.14NAME:
( for revision purpose only– not an holiday assignment)
PHYSICS
1) An athlete runs a certain distance before taking a long jump. Why? 2) A cyclist does not come to rest immediately after he stops pedaling. Give reason. 3) It is advised to tie your baggage kept on the roof of the bus with a rope. Give reason. 4) Give two examples to show that greater the mass greater the inertia. 5) Calculate the of a toy car weighing 200g and moving with a velocity of 5m/s. 6) What is the acceleration produced by a force of 12N exerted on an object of mass 3kg? 7) A car weighing 1600kg moving with a velocity of 30m/s retards uniformly coming to rest in 20s. Calculate the a) Initial momentum of the car

b) Final momentum of the car
c) Rate of change of momentum
d) Acceleration of the car
e) Magnitude of the force applied.
8) A cricket ball of mass 100g moving with a speed of 30m/s is brought to rest by a player in 0.03s. Find the change in momentum of the ball and the average force applied by the player. 9) A 1000kg mass having a speed of 10m/s is brought to rest over a distance of 100m. Find the retardation and retarding force. 10) A truck starting from rest rolls down a hill with a constant acceleration. If it travels a distance of 300m in 10s, find its acceleration. Find the force acting on it if the mass is 8000kg. CHEMISTRY

WS .NO:1 TOPIC: MATTER IN OUR SURROUNDINGS ANSWER THE FOLLOWING QUESTIONS IN A WORD OR A SENTENCE:
1.State the common characteristic of liquid and gas.
2.Equal amounts of a solid and a liquid are taken. Which of these will be denser? Why? 3.A substance has a definite volume but no definite shape. Identify which state of matter will be this substance.

4.What is evaporation?
5.The melting point of an element is 1535k.What would be its physical state at 335k? ANSWER THE FOLLOWING QUESTIONS IN ABOUT 30 WORDS...
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