Pressure in Fluids and Atmospheric Pressure Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer Type for Class-9 ICSE Concise Physics. There is the solutions of Very short Answer type Questions of your latest textbook which is applicable in 2023-24 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9.
Pressure in Fluids Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer
(ICSE Class – 9 Physics Concise Selina Publishers)
| Board | ICSE |
| Class | 9th |
| Subject | Physics |
| Writer / Publication | Concise selina Publishers |
| Chapter-4 | Pressure in Fluids and Atmospheric Pressure |
| Exe – 4B | Atmospheric Pressure and it’s Measurement |
| Topics | Solution of Exe-4(B) Very Short Answer Type |
| Academic Session | 2023-2024 |
Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer Type
Ch-4 Pressure in Fluids and Atmospheric Pressure Physics Class-9 ICSE Concise
Page 112
Question 1. Write the numerical value of the atmospheric pressure on the surface of earth in pascal.
Answer:
1.013 x 10 5 pascal
Question 2. What physical quantity is measured in torr ? How is it related to the S.I. unit of the quantity?
Answer:
Atmospheric pressure is measured in ‘torr’.
1 torr = 1 mm of Hg.
Question 3. Name the physical quantity which is expressed in the unit ‘atm’. State its value in pascal.
Answer:
At normal temperature and pressure, the barometric height is 0.76 m of Hg at sea level which is taken as one atmosphere.
1 atmosphere = 0.76 m of Hg = 1.013 x 105 pascal
Question 4. A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar , balloon gets more inflated, how does the pressure change ; increase , decrease or remain same , inside the (a) bell jar and (b) balloon ?
Answer:
(a) decrease
(b) decrease
Question 5. What is the purpose of a barometer?
Answer:
A barometer is used to measure atmospheric pressure.
(Pressure in Fluids and Atmospheric Pressure Exe-4B Very Short Class-9 ICSE)
Question 6. What is meant by the statement ‘the atmospheric pressure at a place is 76 cm of Hg’? State its value in Pa.
Answer:
The atmospheric pressure at a place is 76 cm of Hg means at normal temperature and pressure, the height of the mercury column supported by the atmospheric pressure is 76 cm.
76 cm of Hg = 1.013 x 105 pascal
Question 7. How is the barometric height of a simple barometer affected if
(a) Its tube is pushed down into the trough of mercury?
(b) Its tube is slightly tilted from vertical?
(c) A drop of liquid is inserted inside the tube
Answer:
(a) The barometric height remains unaffected.
(b) The barometric height remains unaffected.
(c) The barometric height decreases.
Question 8. State two uses of a barometer.
Answer:
Two uses of barometer:
(a) To measure the atmospheric pressure.
(b) For weather forecasting
Question 9. How is the height of mercury in a barometer affected when it is taken to (i) a mine, and (ii) a hill?
Answer:
(i) In a mine, reading of a barometer increases.
(ii) On hills, reading of barometer decreases.
Question 10. What do the following indicate in a barometer regarding weather :
(a) gradual fall in the mercury level,
(b) sudden fall in the mercury level,
(c) Gradual rise in the mercury level?
Answer:
(a) It indicates that the moisture is increasing i.e., there is a possibility of rain.
(b) It indicates the coming of a storm or cyclone.
(c) It indicates that the moisture is decreasing i.e., it indicates dry weather.
— : End of Pressure in Fluids and Atmospheric Pressure Exe-4B Very Short Answer Type Solutions :–
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