Question

SECTION –A
Q1. Give one word for the following: (5)
a) Shadow of earth on moon.
b) Type of motion made by the fine particles in any substance.
c) SI unit of length.
d) One two and fro motion of a pendulum about its mean position.
e) Name of the scientist who found that matter is made up of molecules.
Q2. Write True or False. Correct the false statements: (5)
a) Boiling point of water is 100 ° C.
b) SI unit of temperature is Fahrenheit.
c) “Formation of shadows” is an application of rectilinear propagation of light.
d) The moon is self-luminous.
e) Image formed by a pinhole camera is not real.
Q3. Fill in the blanks: (5)
a) Normal temperature of a human body is ___________.
b) The force of attraction between the molecules is known as ____________.
c) The pinhole camera is based on the principle that light travels in __________.
d) Twelve inches equal ____________ feet.
e) ______ exists in all the three states (i. e solid, liquid and gas).
Q4. Do as directed:
a) The sides of a square are 3.2 cm each. Calculate its area. (2)
b) Explain why if the hole in a pinhole camera is bigger than a pinhole, a blurred image
is seen. (2)
c) Give any two examples of translucent substances. (1)
SECTION –B
Q5.
a) Distinguish between the three states of matter on the basis of the following properties:
I. Rigidity.
II. Packing of molecules.
III. Expansion on heating. (3)
b) State three differences between clinical and laboratory thermometer. (3)
c) Define the term “umbra”. Draw a labelled diagram to show the formation of
umbra alone. (2+2)
Q6.
a) What are “panchtatvas“? In this regard, define the terms “anu” and “parmanu”. (3)
b) Convert the following quantities as indicated: (2+2)
I. 4600 g = ___________ kg.
II. 170 kg =______________ quintal.
c) Name the two devices used for measuring length. Define the
term “error of parallax”. (3)
Q7.
a)
In the above diagram, state in which arrangement (a or b) can you see the light of the bulb.
Explain your answer. Also state the property used. (2+1)
b) Describe briefly the molecular model of liquids to explain that a liquid does not have a
definite shape but has a definite volume. (3)
c)Name the instrument used to measure the temperature of a person. Draw its labelled
neat diagram.

Answer 1

Answer:

hello sorry don;t report

Explanation: