7th Science - Heat and Temperature Model Question Paper | QB365

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7th Science - Heat and Temperature Model Question Paper

Published on: 13/12/2019

Heat and Temperature

Download Tamil Nadu 7th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 7th Standard - Science

chapter: - Model Question paper

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Questions:

Multiple Choice Question

4 x 1 = 4

Which of the following temperature conversions is incorrect
K ( Kelvin) = ⁰C ( Celsius) + 273.15

(a)

⁰C	K
-273.15	0

(b)

⁰C	K
-123.	+150.15

(c)

⁰C	K
+127.	+400.15

(d)

⁰C	K
+ 450	+ 733.15

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

The body temperature of a healthy man is; ________.

(a)

0⁰C

(b)

37⁰C

(c)

98⁰C

(d)

100⁰C

International unit of measuring temperature is _______.

(a)

Kelvin

(b)

Fahrenheit

(c)

Celsius

(d)

Joule

Fill in the blanks

3 x 1 = 3

The common laboratory thermometer is a _______ thermometer.

At room temperature Mercury is in _______ state.

Doctor uses _________ thermometer to measure the human body temperature.

Match the following

4 x 1 = 4

Melting point of water

Boiling point of water

10.

Heat

11.

Clinical thermometer

Generic 2

5 x 2 = 10

12.

Why do we jerk a clinical thermometer before we measure the body temperature?

13.

What is the use of kink in clinical thermometer?

14.

A clinical thermometer is not used to measure the temperature of air, why?

15.

Jyothi was prepared to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?

16.

Temperature of Srinagar (J&K) is — 4⁰C and in Kodaikanal is 3⁰C which of them has greater temperature? What is the difference between the temperatures of these two places?

Generic 3

3 x 3 = 9

17.

The body temperature of Srinath is 99⁰F. Is he suffering from fever? If so, why?

18.

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.

19.

Why do we use Mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Generic 5

2 x 5 = 10

20.

State the similarities and differences between the laboratory thermometer and the clinical thermometer.

21.

Draw the diagram of a clinical thermometer and label its parts.

Thinking skills

2 x 2 = 4

22.

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

23.

What must be the temperature in Fahrenheit, so that it will be twice its value in Celsius?

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Answers Key:

Multiple Choice Question

4 x 1 = 4

(d)

⁰C K

+ 450 + 733.15

(b)
37⁰C

(a)
Kelvin

Fill in the blanks

3 x 1 = 3

()
Celsius

()
Liquid

()
Clinical

Match the following

4 x 1 = 4

0^oC

100°C

10.

A form of energy

11.

Kink

Generic 2

5 x 2 = 10

12.

Before we measure the body temperature jerk the thermometer a few times to bring the level of the mercury down.

13.

The kink prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patients mouth.

14.

Gas molecules are randomly moved. So it is not possible to measure temperature of air by clinical thermometer.

15.

It is wrong. Clinical thermometer indicates only 35°C to 42°C. So hot water is greater than 42°C. So it is wrong.

16.

Kodaikanal temperature is greater. The different temperature is
-4°C + 3°C = 7°C

Generic 3

3 x 3 = 9

17.

No. Srinath is not suffering from fever. No person always has exactly the same temperature at every moment of the day. Temperature cycle regularly up and down through the day according to activities and external factors.

18.

Yes, Ramani's statement is correct. I agree Ramani statement. because laboratory thermometer has no kink. When thermometer is taken out from the hot water, the mercury level will fall. We can't measure the correct temperature.

19.

a) Its expansion is uniform (for equal amounts of heat it expands by equal length)
b) It is opaque and shining
c) It is a good conductor of heat.
d) It does not stick to the sides of the glass tube.
e) So mercury is used in the thermometer
f) Water cannot used in thermometer.
1) Its expansion is not in uniform.
2) It is stick to the sides of the glass tube.

Generic 5

2 x 5 = 10

20.

Difference between clinical and laboratory thermometer

Clinical Thermometer	Laboratory Thermometer
Clinical thermometer is scaled from \(35^{\circ} \mathrm{C}\) to \(42^{\circ} \mathrm{C}\) or from \(94^{\circ} \mathrm{F}\) to \(108^{\circ} \mathrm{F}\)	Laboratory thermometer is generally scaled from \(-10^{\circ} \mathrm{C}\) to \(110^{\circ} \mathrm{C}\).
Mercury level does not fall on its own, as there is a kink near the bulb to prevent the fall of mercury level.	Mercury level falls on its own as no kink is present.
Temperature can be read after removing the thermometer from armpit or mouth.	Temperature is read while keeping the thermometer in the source of temperature e.g. a liquid or any other thing.
To lower the mercury level jerks are given.	No need to give jerk to lower the mercury level.
It is used for taking the body temperature	It is used to take temperature in laboratory.

21.

Thinking skills

2 x 2 = 4

22.

\(\begin{array}{|l|c|} \hline \text { Animals and birds } & \text { Temperature (celsius) } \\ \hline \text { Dog } & 37.5-39.09 \\ \hline \text { Cat } & 38.0-39.5 \\ \hline \text { Rabbit } & 38.5-39.5 \\ \hline \text { Pigeon } & 41.0-44.1 \\ \hline \text { Crow } & 40.0 \\ \hline \text { Chicken } & 41.7 \\ \hline \end{array}\)

23.

F = 2 C
\(\mathrm{F}=\frac{9}{5 \mathrm{C}\ +\ 32}\)
when we substract 9/5 C from both sides
\(2 \mathrm{C}-9 / 5 \mathrm{C}=32 \quad\left(2 \mathrm{C}=\frac{10}{5 \mathrm{C}}\right) \)
\(\frac{10}{5 \mathrm{C}}-\frac{9}{5 \mathrm{C}}=32\)
\(\frac{1}{5 C} =32 \)
\(\frac{1}{C} =32 \times 5 \)
\(C = 160^{\circ} \mathrm{C}\)
So, F = 2 C
\(\mathrm{F} =2 \times 160=320^{\circ} \mathrm{F}\)