Question 1 :
Energy enters in a food chain through which of the following consumers:
Question 5 :
Water is cooled from 4 °C to 0 °C. It will:
Question 8 :
Convert {tex} 45 ^ { \circ } \mathrm { C } {/tex} into Fahrenheit {tex} \left( { } ^ { \circ } \mathrm { F } \right) {/tex}
Question 9 :
The source of energy in an ecosystem is which of the following source listed below:
Question 12 :
Without green house effect, the average temperature of Earth’s surface would have been:
Question 14 :
A cube of each side {tex} 5 \mathrm { cm } {/tex} is placed inside a liquid. The pressure at the centre of one face of cube is {tex} 10 \mathrm { Pa } {/tex}. Calculate the thrust exerted by the liquid on this face.
Question 15 :
A square plate of side {tex} 10 \mathrm { m } {/tex} is placed horizontally {tex} 1 \mathrm { m } {/tex} below the surface of water. The atmospheric pressure is {tex} 1.013\times 10 ^ { 5 } \mathrm { Nm } ^ { - 2 } {/tex}. Calculate the total thrust on the plate.
Question 16 :
Pressure at a point inside a liquid does not depend on :
Question 18 :
A dam for water reservoir is built thicker at the bottom than at the top because :
Question 19 :
A body of density sinks in a liquid of density . The densities and are related as shown below:
Question 21 :
What fraction of metal of density {tex} 3400 \mathrm{kgm}^{-3} {/tex} will be above the surface of mercury of density {tex} 13600 \mathrm{kgm}^{-3} {/tex}, while floating in mercury?
Question 22 :
A wooden block floats in alcohol with {tex} 3 / 8 {/tex} of its length above alcohol. If it is made to float in water, what fraction of its length is above water? Density of alcohol is {tex} 0.80 \mathrm{~g} {/tex} {tex} \mathrm{cm}^{-3} {/tex}
Question 23 :
The force experienced by a body when partially or fully immersed in water is called :
Question 24 :
The phenomenon due to which a solid experiences upward force when immersed in water is called :
