Atmospheric pressure at Peshawar is……… than Murree.
a) greater
b) sometime equal
c) always equal
d) less
Experiments show that pressure of a gas depends upon…………….
a) Quantity and temperature
b) Atmospheric pressure
c) Quantity
d) none of these
The SI unit of area is……………………
a) m
b) m2
c) m3
d) N
How much weight of air is always over your head………………..
a) 1000kg
b) 100kg
c) 10kg
d) 1kg
A dropper to fill ink works because of which of the following……………
a) Friction
b) Force
c) Air pressure
d) All of these
An aerosol is suspension of tiny liquid particles in a…… NTS CT 25/08/2019 (11:30)
a) Liquid
b) Gas
c) Solid
d) Vapor
The correct answer is: **a. 1000 kg** ### Explanation: The atmosphere exerts pressure on everything at the Earth's surface, including your head. Atmospheric pressure at sea level is about **101,325 pascals** (Pa), or **1 atmosphere (atm)**. This pressure is due to the **weight of the air above you**. The total weight of air pressing down on an average adult human body (with a surface area of about **1 square meter**) is approximately **10,000 newtons**, which corresponds to a **mass of about 1000 kg**. So, the air above your head (and body) weighs about **1000 kilograms**.
by at 2025-05-24 07:30:12