7 science Term 2 - Heat and Temperature Evaluation answers

7th Science Heat and Temperature Textual Evaluation Answers

I. Choose the correct answer:

Heat And Temperature Class 7 Samacheer Question 1.
International unit of measuring temperature is
(a) Kelvin
(b) Fahrenheit
(c) Celsius
(d) Joule
Answer:
(a) Kelvin

Heat And Temperature 7th Standard Question 2.
In thermometer when bulb comes in contact with hot object, liquid inside it
(a) expands
(b) contracts
(c) remains same
(d) none of above
Answer:
(a) expands

Heat And Temperature 7th Class Question 3.
The body temperature of a healthy man is;
(a) 0°C
(b) 37°C
(c) 98°C
(d) 100°C
Answer:
(b) 37°C

 Question 4.
Mercury is often used in laboratory thermometers because it
(a) is a harmless liquid
(b) is silvery in colour and is attractive in appearance
(c) Expands uniformly
(d) is a low cost liquid
Answer:
(c) Expands uniformly

 Question 5.
Which of the following temperature conversions is incorrect K (Kelvin) = oc ( Celsius) + 273.15

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II Fill In the blanks:

1. Doctor uses ________ thermometer to measure the human body temperature.

2. At room temperature mercury is in _______ state.

3. Heat energy transfer from _______ to _______

4. -7°C temperature is _______ than 0°C temperature.

5. The common laboratory thermometer is a _______ thermometer.

Answer:

1. clinical

2. liquid

3. hotter object, colder object

4. less

5. mercury

III. Match the following:

1. Clinical thermometer – A form of energy
2. Normal temperature of human body – 100°C
3. Heat – 37°C
4. Boiling point of water – o°c
5. Melting point of water – Kink

Answer:

1. Clinical thermometer – Kink
2. Normal temperature of human body – 37°C
3. Heat – A form of energy
4. Boiling point of water – 100°C
5. Melting point of water – 0°C

IV. Give very short answer:

7th Standard Science Heat And Temperature Question 1.
Temperature of Srinagar (J&K) is -4°C and in Kodaikanalis 3°C which of them
has greater temperature ? What is the difference between the temperatures of
these two places?
Answer:
Kodaikanal has greater temperature.
Temperature of srinagar (J &K) = -4°C
Temperature of = 3°C
Difference = -4°C + 3°C = 7°C
Srinagar is colder than that of kodaikanal.

7th Standard Heat And Temperature Question 2.
Jyothi was prepared to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?
Answer:
It is wrong, because clinical thermometer has small temperature range (35°C to 42°C or 94°F to 108°F). If it is used to measure the temperature of hot water, the glass will crack/ burst due to excessive pressure created by expansion of mercury.

Science 7 Heat And Temperature Question 3.
A clinical thermometer is not used to measure the temperature of air, why?
Answer:
The range of the clinical thermometer is less than that of thermometer used to measure temperature of air.

 Question 4.
What is the use of kink in clinical thermometer?
Answer:
A kink is clinical thermometer prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patient’s mouth, so that the temperature can be noted conveniently.

Question 5.
Why do we jerk a clinical thermometer before we measure the body temperature?
Answer:
The jerk to the thermometer will allow the mercury level to flow into the bulb so that the mercury level is below the normal temperature.

V. Give Short Answer

 Question 1.
Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
Answer:

1. We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
2. A small change in the temperature causes change in volume of a liquid.
3. Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
4. Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
5. Due to this constraints it is not used as a thermometric liquid.

 Question 2.
Swathi kept a laboratory thermometer in hot water for some time and took it out to read the temperature. Ramani said it was a wrong way of measuring temperature. Do you agree with Ramani ? Explain your answer.
Answer:
Yes, I agree with Ramani.

1. Laboratory thermometer does not have a kink. So, when Swathi takes out the thermometer, the level can go back because of absence of kink.
2. So Swathi should note the reading when the thermometer bulb has surrounded by hot water.

Question 3.
The body temperature of Srinath is 99°F. Is he suffering from fever? If so, why?
Answer:
Srinath is having a fever because the normal body temperature is 98.6°F.

VI. Give long answer:

Question 1.
Draw the diagram of a clinical thermometer and label its parts
Answer:

Question 2.
State the similarities and differences between the laboratory thermometer and the clinical thermometer.
Answer:
Similarities between laboratory thermometer and the clinical thermometer:

1. Both clinical and laboratory thermometers have long, narrow and uniform glass tubes.
2. Bulbs contain mercury.
3. Both have Celsius scale.

Differences:

Laboratory thermometer:

1. Laboratory thermometer is generally scaled from -10°C to 11 CPC.
2. Mercury level falls on its own as no kink is present.
3. Temperature is read while keeping the thermometer in the source of temperature, e.g. a liquid or any other thing.
4. No need to give jerk to lower the mercury level.
5. It is used to take temperature in laboratory.

Clinical thermometer:

1. Clinical thermometer is scaled from 35°C to 42°C or from 94°F to 108°F.
2. Mercury level does not fall on its own, as there is a kink near the bulb to prevent the fall of mercury level.
3. Temperature can be read after removing the thermometer from armpit or mouth.
4. To lower the mercury level jerks are given.
5. It is used for taking the body temperature.

VII. Higher Order Thinking questions:

Question 1.
What must be the temperature in Fahrenheit, so that it will be twice its value in Celsius?
Answer:
According to the question, F = 2C and C₁ = C
F = 9C5 + 32
2c =95 C + 32
2c – 95 c = 32 ⇒10c–9c5 = 32 + 0
1c5 = 32

Question 2.
Answer:
Go to a veterinary doctor (a doctor who treats animals). Discuss and find out the normal temperature of domestic animals and birds.

1. Dog – 38.9°C
2. Horse – 38°C
3. Rabbit – 38.3°C
4. Cow – 38.6°C
5. Cat – 39°C
6. Goat- 39.7°C
7. Pigeon – 44.1°C
8. Crow – 40°C
9. Duck – 40.7°C
10. Karaknath – 41.8°C
11. Parrot – 41°C

Assignment 3 - Class : 10- Subject : Science

 

Biology

UNIT-12 Plant Anatomy and Plant Physiology Part - A

I. Choose the correct answer

1.  Who is the father of plant anatomy?

 a) Sachs                b) Nehemiah Grew         c) Melvin Calvin      d) C.N.R.Rao

 2.  The group of cells which are similar or dissimilar in structure and origin that perform similar function is called

a) Organ System  b) Vascular Bundles         c) Tissues              d) Pericycle

3.  The pores present in Epidermis are called

a) Stomata           b) Cuticle                         c) Trichome         d) Stele

4.  Xylem and Phloem are present in different radii of ----------

a) root                b) stem                              c) leaf                   d) flower

5.  If xylem and phloem lie on the same radii that vascular bundle is --------------

a) radial bundle                                  b) conjoint bundle

c) concentric and amphivasal              d) amphicribral

  

Part - B

 II.  Short Answer.

6. What are tissues?

 

7. Classify the types of plant tissues.

 

8. What are the functions of Dermal or Epidremal tissue system?

III.   Write In detail

      9.a)Differentiate the following Monocot root and Dicot root

    b) Draw a neat labelled diagram of Radial vascular bundle.

 

10.a) Write the components and functions of plant tissue system.

      b) Classify the tissues based on their ability to divide.

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Assignment 2- Class:10--Subject: Science

 

Chemistry -Unit 1

UNIT-7 Atoms and Molecules (Assignment Questions) Part -A

I.  Choose the correct answer

 1.  Number of electrons, protons and neutrons present in   17Cl³⁵,   17Cl³⁷    is-------

a) 17e¯ , 17p+, 17n                                                         b) 18e¯ , 18p+, 17n  

  17e¯ , 20p+, 19n                                                             17e¯ , 17p+, 19n

 c) 17e¯ , 17p+, 18n                                                          d) 18e¯ , 17p+, 18n

20e¯ , 20p+, 17n                                                              17e¯ , 17p+, 20n

2.  Isobars are defined as---------

a)   Elements show same atomic number with different mass number

b)  Elements show same mass number with different atomic number

c)   Elements show same valency

d)  None of these

3.  The Atomicity of Glucose molecule is                .

a) 6                          b) 12                            c)24                       d) 18

4.  The mass of 5 moles of sodium is -------------

a) 46g                   b) 34g                             c) 105g                  d) 115g

5.  Number of atoms present in 3 moles of iron is--------

a)   6.023 x 10²³     b) 18.069 x 10²³              c) 12.046 x 10²³    d) None

Part - B

II.  Short Answer.

6.   Define : Relative atomic mass

 

7.Give any two examples for heteroatomic molecules 8.Calculate the number of moles in 46 g of Sodium?

 

Part - C

III. Write In detail.

9.Give the salient features of “Modern Atomic Theory”.

Assignment 1- Class:10 Subject:Science

 

Assignment

Class:10                                                                                  Subject:Science

Physics

UNIT-1 Laws of motion Part – A

I. Choose the correct answer

1.  Inertia of a body depends on--------------

 

a) Weight of the object                                 b) acceleration due to gravity

 

c) mass of the object                                    d) Both a and b

 2.  In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward. Which principle is followed in this take off of the rocket?

a) Moment of inertia                           b) Conservation of momentum

 c) Newton’s first law of motion           d) Newton’s law of gravitation

 3.  There are two statements

 A)   Newton’s first law is valid from the pilot in an aircraft which is taking off

 B)   Newton’s first law is valid from the observer in a train moving with constant velocity

Which of the following is correct?

 a) A only              b) B only              c) Both A and B       d) Both A and B wrong

 4.    Which of the following law is used to discover new stars and planets?

 a) Newton's first law                          b) Newton's second  law

c) Newton's third law                         d) Newton's law of gravitation

 

5.  The Resultant force of two equal parallel forces acting in opposite direction in the same line of action is

 

a) Fnet = F₁ + F₂                                  b) Fnet = F₂-F₁

 

c) Fnet = F₂+F₁                                   d) Fnet=0

 

Part – B

II.  Short Answer

6.  Define Inertia. Give its classification

7.   If a 5N and a 15N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force.

8.   State Newton’s second law.

 

Part – C

III.  Write in Detail

9. What are the types of Inertia? Give an example for each type.

9th Science Chapter 5 Magnetism and Electromagnetism

  

9th Science Solutions 

Chapter 5 Magnetism and Electromagnetism

 

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