Answer:
Explanation:
The calcite Crystal can be identified by carrying out an acid test on it. This is done by bringing it in contact with a weak acid which cause crack in it structure. Hence a little of carbondioxide gas is released.
Since diamond is the hardest object,it can be identified on a Mohs scale. Likewise it can be tested by bringing it in contact with a newspaper, if the letters on the paper are not seen, that shows it is a pure diamond.
Window glass is identified by the code on it.
While Quartz Crystal is identified by scratch test. When it is used to scratch all other softer stones and metal, it leaves mark on them.
Answer: C) By collecting run off during the rainy season for future irrigation increases the agricultural production
Explanation:
Water harvesting is a process of collection of rain water by using special water storing systems. This water storage practice helps during the scarcity of water like in dry summer seasons and in conditions of drought. Such water can be treated with filters to make it potable for drinking. But generally the water is used for the purpose of irrigation in the agricultural field and household sanitary requirements.
On the basis of the above description, By collecting run off during the rainy season for future irrigation increases the agricultural production is the correct option.
The correct answer of this question is : 10.2 Kg.
EXPLANATION :
As per the question, the ball is attached to the cable.
The tension produced in the cable when the ball is hanged from it, is equal to the weight of the ball. It is so because the cable maintains its equilibrium.
Hence, tension in the cable = weight of the ball.
The tension produced in the cable is given as T = 100 N.
The weight of the ball is equal to the product of mass with acceleration due to gravity.
Let the mass of the ball is m.
Hence, weight of the ball W = mg
Here, g is known as acceleration due to gravity, and its value is g = 
.
From above, we know that W = T
⇒ mg = 100 N
⇒ m = 
Kg
= 
= 10.2 Kg. [ans]
