जिल्हा परिषद माध्यमिक विद्यालय, विडूळ ता . उमरखेड जि. यवतमाळ
Online Exam
Class - 10 th , Sub :- Science and Technology Part - I, Marks - 40, Time - 2 Hours
Date - 08 / 03 / 2021 , Timing - 12 : 00 to 2 : 00
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Q.1. (A) Choose the correct option: [5]
i. The gravitational force between two bodies is directly proportional to the product of the masses of those bodies and is ……….of the distance between them.
a) inversely proportional to the square
b) directly proportional to the square
c) inversely proportional to the cube
d) inversely proportional to the square root
ii. At the time of Mendeleev …..elements were known.
a) 56
b) 65
c) 63
d) 118
iii. which of the following statements about the modern periodic table is correct ?
a) 18 horizontal rows are known as periods.
b) 7 vertical columns are known as periods.
c) 18 vertical columns are known as groups.
d) 7 horizontal rows are known as Periods
iv. We can see the sun even when it is little below the horizon because of -------------
(a) absorption of light
(b) dispersion of light
(c) refraction of light
(d) reflection of light
v. The right hand thumb rule is also called …………….rule.
a) Newton’s law of motion
b) Newland’s law of Octave
c) Mendeleev’s periodic law
d) Maxwell’s cork- screw
(B) Solve the following sub-questions: [5]
i. State true or false:
The similarity between the properties of the first and eighth elements is called the octave rule.
ii. Write the correlated answer:
Iodine : solid :: bromine : .......
iii. Find odd man out:
Carbon, Calcium, Oxygen, Neon
iv. Match the columns .
' A ' ' B '
1) Absolute humidity a) J/cal
2) Latent heat b) J/Kg° C
3) Specific heat capacity c) KJ/Kg
4) Heat d) no unit
e) Kg/m3
v. Name the following ;
Two elements having two orbits
Q.2. (A) Give scientific reasons (any two): [4]
i. Mendeleev kept vacant places in the periodic table.
ii. It looks like a sack that encloses with a drawstring.
iii. Coins are made from metals and alloys.
(B) Answer the following questions (any three): [6]
i. In the modern periodic table, the positions of 1 to 20 elements are shown here.
Identify the elements A and B. Write their atomic number.
ii. Distinguish between Direct current and alternating current.
iii. Observe the following diagram and write the answers to the questions given below.
iv. What is refraction of light? Explain with the help of example.
v. Explain Bayer’s process.
Q. 3. Answer the following Questions .(any Five ) (15)
i. Explain the reaction given in figure?
ii. Explain how heat capacity of a solid can be determined by the method of mixture.
iii. Write the function of the human eye and label parts of the figure given below.
iv. Explain the Hydraulic separation method with a neat labelled diagram.
v. Observe the following diagram and write answers.
B) Explain the method .
C) Give two examples of this method.
vi. Complete the following table with writing IUPAC name of carbon compound.
vii. Write the properties of Ionic compounds.
viii. Write functions of Military satellite and Navigational satellite.
Q. 4. Answer the following . (any one) (05)
i. Explain the following temperature-time graph.
ii. Read the following paragraphs and write the answers.
Mars is the second closest celestial object to Earth after the Moon. It was sent to Mars by many nations. But since the campaign was difficult, almost half of the
campaigns were not successful. But we have done something that we should be proud of. Launched by ISRO in November 2013 at a very low cost, the Mars rover
was launched into Mars orbit in September 2014 and gained important information about the surface and atmosphere of Mars.
A) After the moon, which is the closest celestial object to the earth?
B) When did ISRO launch Mars spacecraft?
C) What important information did ISRO's Mars rover get?
D) Explain that specific velocity does not depend on the mass of the satellite?
33) Explain the need and importance of space missions.
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