English Medium Class 10 - CBSE Question Bank Solutions for Science

How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.

 A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.

What is the other name of Maxwell's right-hand thumb rule?

State and explain Maxwell's right-hand thumb rule.

Name the rule which gives the direction of induced current.

If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?

Name the most important part of the human brain.

State one function each of cerebellum and pons.

State and explain Fleming's right hand rule.

Name and state the rule to find the direction of current induced in a coil due to its rotation in a magnetic field.

Name two parts of the body which contain receptors of chemical stimuli.

Which part of the eye contains cells which are sensitive to light?

Give three examples of reflex actions.

State whether coughing is a voluntary action or reflex action.

Fill in the following blanks with suitable words :

Our.............system allows us to react to our surroundings. Information from receptors passes along...........neurons to our brain. Our brain sends impulses along..........neurons to our muscles.

Fill in the following blank with suitable word :

A neuron which carries an impulse to the brain is called a ........... neuron.

What are the various sense organs in our body?

What is meant by receptors and effectors? Give two examples of each.

What is spinal cord? What is its main function?

Give the functions of medulla.