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Tn 9th Science Unit 1 Assignment Answers EM

radangfx September 29, 2021

Tn 9th Science Unit 1 Assignment Answers EM: Here is the full assignment answer key for TNSCERT 9th science assignment in both print and pdf download with answers, This page gives you both English medium and we also have Tamil medium answers for 9th standard science. As per the Tamilnadu educational departments order, all school students must submit their assignments on time, But most of the students do not even start the assignment process, so we want to help those students, and here is the full assignment answer key

9th Science English Medium Assignment 2021 with Answer

For Tamil Medium Answers Please Click Here

Here are the Full Questions in PDF – Click Here to Download

Assignment

Class:9 Subject: Science

Physics

Unit 1 – Measurement
Part- A

I. 1 Mark Questions :

Unit of luminous intensity is____

a) Kelvin

b) candela

c) ampere

d) mole

Answer:- b) candela

Light year is ——–

a) 94.6 x 10¹⁵ m.

b) 9.46 x 10¹⁵ mm.

c) 94.6 x 10^-15 m.

d) 9.46 x 10¹⁵ m

Answer:- d) 9.46 x 10¹⁵ m

3) Absolute zero temperature is

a) 0 K

b) 0◦C

c) 0◦F

d) 100◦C

Answer:- a) 0 K

4)Least count of screw gauge is ——–

a) 0.01 mm

b) 0.1 mm

c) 1.0 mm

d) 0.01 cm

Answer:- a) 0.01 mm

5)What is the name of the balance commonly used in Jewellery shops?

a) Common balance

b) Spring balance

c) Digital balance

d) Physical balance

Answer:- c) Digital balance

Part- B

II. Short Answer

1.Define – Astronomical unit

Astronomial unit is the mean distance of the sun from the centre of the earth

1 Astronomical Unit = 1.496 x 10¹¹m

Define – Least count

The smallest length which can be measured by metre scale is called least count

If a man has a mass of 50 kg on the earth, then what is his weight?

Mass of the man (m) = 50 kg

g =9.8 m/s2

Weight = m x g

= 50 x 9.8

Weigh tof the man is 490 N

Part- C

III. Write in detail.

Write any 5 Rules in writing SI Units and their Symbols.

The unit names after sceientists are not written with a capital inital letter Eg Newton, henry, ampere and watt
The symbols of the units named after sceintists should be written by the initial capital letter. Eg N for newton, H for hendry, A for ampere and W for watt
Small letters are used as symbols for units not derived from a proper noun, Eg m for metre, kf for kilogram
No full stop or other punctuation marks should be used within or at the end of symbols Eg 50 m and not as 50 m.
The symbols of the units are not expressed in plural form Eg 10 kg not as 10 kgs
Accepted symbols alon should be used, Eg ampere should not be written as amp and second should not be written as sec.