Tripura Board Model Question Paper for Class 9 Physics and Chemistry Annual Exam

MODEL QUESTION PAPER

Subject : Physics and Chemistry
Class : IX
Group - A
Answer the following question : 1x7

1. At 250°c the physical state of water is
a) Liquid b) Gas c)solid& gas d) none
2. Which one is Chemical change -
a) Rusting of iron b) Solidification of water
c) Mixture of sand and iron d) None of these
3. Which one is the symbol of chorine
a) Cu b) Co c) Ca d) Cl
4. Name the instrument used for separate water from the mixture of oil and water.
5. Write the symbol of the compound that is formed with element A and B whose
valency is x and y.
6. Name the negatively charged particle of atom.
7. What is mass number.
Group-B
8. What is Evaporation. State two factors that are effecting rate of evaporation.
or
Put an incense stick (Agarbati) in a corner of classroom. Now light the incense stick.
What happens? Do you get the smell sitting at a distance? Record your observation.
9. Write three differences between metal and nonmetal.
10. Least any three human activities that lead to air pollution. What are the effect of
air pollution on human body?
11. What is greenhouse effect. Name two green house gases
Or .
Why is water essential for life-explain
Group-C
12. State the law of constant proportion . Which postulate of Dulton atomic theory can
explain the law of constant proportion? Calculate the molecular mass of HN03.
23
13. What do you understand from 11 Na . Explain briefly . State the drawback of
Rutherford model of atom.
or
State differences between Isotopes and Isobars.

b g
If Bromine atom is available in the form of two isotopes as 3579 Br 49.7% and 3581 Br (50.3%).
calculate the average atomic mass of bromine.

Physics- 27 numbers
Group – A
Answer the following question

14. What is measured at odometer of motor vehicle-
a. Time b) distance c) speed d) none of the above
15. S.I unit of pressure is
a. N/m2 b)N/cm2 c) Kg/m2 d) g/m2
16. Weight of an object on earth surface is 12 N, then weight of the object on moon
will be-
a) 12N b) 6N c)2N d) IN
17. The electric energy used in household express in -
a) Joule b) Unit c) Wattd) dyne
18. Define speed.
19. What is the value of universal gravitation constant?
20. Mass of an object is 1kg. what is its weight on the earth.
21. Calculate the work done of an object by an applied force when displacement is
zero.
Group – B
22. Prove the equation of motion v=u+at by graphical method.
Which physical quality is measured by the area occupied under distance time graph?
or
What will be the nature of distance time graph in case of uniform and non-uniform
motion ?
23. State Newton’s law of gravitation and write mathematical formula of it.
or
State Archimedes principal. Volume of 50g of a substance is 20cm3 if the density of
water is lg/cm3, will the substance float or sink in water ?
24. What is work? Why the unit of work and energy are same?
Group – C
25. Give an experiment to show that sound needs a material medium for its propagation.
What type of wave is sound wave ?
or
What is an echo? What is the minimum distance of obstacle from the source of

sound to hear distinct echoes? A person clapped his hand near a cliff and heard the
echo after 2 sec. what is the distance of cliff from the person if the speed of sound V
is taken 346m/s.
26. State the second law of Newton and calculate force from it.
or
State the laws of conservation of momentum.
A hokey ball of mass 200g travelling at 10ms–1 is struck by a hockey stick so
as to return it along its original path with a velocity at 5ms–1.
Calculate the magnitude of change of momentum occurred in the motion of
hokey ball by the force applied by the hokey stick.