List of practice Questions

The ketone in the following is:
The element producing hydrogen gas with cold water is:
Which of the following lenses should be used to read small letters?
The cause of twinkling of stars is:
The image by a convex mirror of an object placed at infinity is:
The colour having the largest angle of deviation on passing white light through a prism will be:
Describe in brief the structure of the kidney in humans and also describe its functions.
Write a short note on pH of a solution.
Write a short note on unsaturated hydrocarbon.
What is an electromagnet? State its two uses.
How does an electromagnet differ from a permanent magnet?
State any two properties of the electrochemical series.
Explain the formation of \( \text{Na}^+ \text{Cl}^- \) by combination of Na atom (Atomic number 11) and Cl atom (Atomic number 17).
An object of 3 cm height is placed at a distance of 8 cm from a concave mirror which produces a virtual image of 4.5 cm height. Find the position of the image and focal length of the mirror.
Explain why the colour of the clear sky appears blue.
What are the factors on which the force acting on a current-carrying conductor depends when placed in a uniform magnetic field? Write the rule to find the direction of this force.
What is the unit of specific resistance? A resistance of 25 \( \Omega \) is connected to a 12-volt battery. Calculate the heat energy in joules generated per minute.
Intake of oxygen from outside of the body and breakdown of food sources as per requirement of the cell is called
The main thinking part of the brain is called
Which of the following plants has a unisexual flower?
How much organic matter reaches from one trophic level to the next trophic level?
The product of photosynthesis in plants is
Which among the following is not a plant hormone?
Which type of mirror is used as a rear-view mirror in cars? Why do we prefer it?
Nature of hydrogen ion (\( H^+ \)) is