Question

QI)
A) Answer the following.
1) Fill in the blanks :
(3)
a) Refractive index depends upon .......... of light.
b) The amount of water vapour in air is determined in terms of its ...........
c) When electric current is passed through acidulated water
of water
takes place.
2) Find odd man out and justify.
(1)
a) Voltmeter, Ammeter, Galvanometer, Thermometer.
3) 6C, 3 Li, 9F, 7N, 80. Which of the above elements has the highest non
metallic character ?
(1)
B) Choose the correct alternative and rewrite the sentence.
(5)
a) The device used for producing current is called a
(i) Electric motor (ii) ammeter (iii) galvanometer (iv) generator
b) Person has a mass of 8.4 kg. Its weight on moon if the value of 'g' on earth is
10 m/s2, will be
(1) 14 N (ii) 504 N (iii) 25 N (iv) 450 N
c) Milind adds zinc dust into a test tube containing copper sulphate solution. He
finds that
(i) The solution turns green
(ii) The temperature of the solution increases
(iii) A white precipitate is formed
(iv) A brown gas is formed
d)
much heat energy is necessary to raise the temperature of 5 kg of
water from 20° C to 100° C.
(i) 400 Kcal (ii) 500 Kcal (iii) 400 cal (iv) 500 cal
e) When rays of light are incident on a glass slab, then the incident ray and
emergent ray are to each other.
(i) Parallel (ii) perpendicular (iii) concurrent (iv) opposite
Q II) Answer the following. (any 5)
(10)
1) What is a) acceleration due to gravity. b) Centripetal force
2) Write the name and symbol of the element from the description :
a) The atom having the smallest size.
b) The atom having the smallest atomic mass.
c) The most electronegative atom.
d) The noble gas with the smallest atomic radius.
3) What is the difference between heat and temperature ?
4) What is meant by latent heat? How will the state of matter transform if latent
heat is given off ?
5) If the speed of light in a medium is 1.5 x 10 m/s, what is the absolute
refractive index of the medium ?
6) Draw a ray diagram if the object is placed at focus in front of a convex mirror.
Q III) Answer the following. ( any 5]
(15)
1) An object thrown vertically upwards reaches a height of 500 m. What was its
initial velocity ? How long will the object take to come back to the earth ?
Assume g - 10 m / sa
2) Metallic character goes on decreasing while going from left to right in a period,
Give reason
3) Explain the similarity and difference in two events, namely adding NaOH to
water and adding CaO to water.
4) Observe the following graph. Considering the change in volume of water as its
temperature is raised from 0 °C, discuss the difference in the behaviour of water
and other substances. What is this behaviour of water called?
1
5) Draw
a figure explaining various
terms
related to a lens.
Temperature
6) Describe the following statements,
A rainbow is the combined effect of the refraction, dispersion, and total internal
reflection of light.
Q IV) Answer the following. (any 1]
(5)
1) Identify the figures and explain their uses.
a.
b.
2) What is myopia
corrected ?
? What are its reasons ? How it can be
Explain with the help of diagram.​

Answer 1

Answer:

The solution turns green

(ii) The temperature of the solution increases

(iii) A white precipitate is formed

(iv) A brown gas is formed

d)

much heat energy is necessary to raise the temperature of 5 kg of

water from 20° C to 100° C.

(i) 400 Kcal (ii) 500 Kcal (iii) 400 cal (iv) 500 cal

e) When rays of light are incident on a glass slab, then the incident ray and

emergent ray are to each other.

(i) Parallel (ii) perpendicular (iii) concurrent (iv) opposite

Q II) Answer the following. (any 5)

(10)

1) What is a) acceleration due to gravity

Answer 2

Answer:

force=mass×acceleration

=>mass=

acceleration

force

given,force=100,acceleration=20m/s

2

=>mass=

20

100

=5kg