Time: 1:30 hrs
Class: 9 FM: 40
Subject: Science PM: 16
Group A 8x1 = 8
1.a)
Write the SI units of force and density .
b) What are the critical angles for glass and water?
c) State Newton's second law of motion.
d) Write the necessary condition required to occur total internal reflection.
e) What do you mean by pitch of sound?
f) Write one application of ultra sound.
g) What is inertia?
h) Write
the formula of mechanical advantage and V.R of lever.
Group B 6x2 = 12
2. Write any two difference between work and power.
3. Newton's first law of motion is also called law of inertia. Why?
4. A 2 kg metal ball is moving with a velocity of 25 m/s . calculate kinetic
energy .
5. State the properties of electromagnetic wave.
6) Differentiate echo and reverberation.
7) Why is the sound of girl is sharper than the sound of boys?
Group C. 4x3 = 12
8)Study the given diagram and answer the following questions.
a) what type of simple machine is it?
b) Calculate MA and VR
c) Calculate efficiency .
9) What is the relation of acceleration with mass and force ?
A bus starting from rest accelerates with 0.5 m/s2 . Calculate its final velocity at the end of 10 seconds.
10)Define 1 watt power. In a wheel and axle Diameter of wheel is 100 cm and radius of axle is 0.1 m. Calculate VR.
11) Study
the given figure and answer the following questions.
i) Which
phenomenon is shown in given diagram?
ii) Which
medium is denser out of air and water? Why?
iii) Write
any one law of this phenomenon .
Group D 2 x 4
12) Define an echo.
A man
hears an echo after a gun is fired . How far is the reflecting surface ? Given
that speed of sound is 340 m/s.
13) Answer
the question on the basis of given diagram
.i) Which phenomenon is shown in given diagram?
ii)Name the rays A and B
iii)compare the speed of A and B
iv) Name the rays above B and below A.
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