List of practice Questions

What are the necessary conditions for autotrophic nutrition and what are its byproducts?

What is the role of the acid in our stomach?

How are fats digested in our bodies? Where does this process take place?

Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 
  1. 9 Ω
  2. 4 Ω

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

The autotrophic mode of nutrition requires

The xylem in plants are responsible for

The kidneys in human beings are a part of the system for

How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω , 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
What is the far point and near point of the human eye with normal vision?
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
How is a voltmeter connected in the circuit to measure the potential difference between two points?

Explain the mechanism of the cleaning action of soaps.

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –

Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons

Which of the following hydrocarbons undergo addition reactions: C2H6 , C3H8 , C3H6 , C2H2 and CH4 .

What is hydrogenation? What is its industrial application?

What is meant by power of accommodation of the eye?

What change will you observe if you test soap with litmus paper (red and blue)?

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –

Explain the formation of scum when hard water is treated with soap.