Periodic Classification of Elements — Science STD 10 — Question

Which precautions will you follow to maintain the reproductive health?

The wire in Figure below is being moved downwards through the magnetic field so as to produce induced current.

What would be the effect of:

1. Moving the wire at a higher speed?
2. Moving the wire upwards rather than downwards?
3. Using a stronger magnet?
4. Holding the wire still in the magnetic field?
5. Moving the wire parallel to the magnetic field lines?

A boy noted the readings on his home’s electricity meter on Sunday at 8AM and again on Monday at 8AM (see figure below).

1. What was the meter reading on Sunday?
2. What was the meter reading on Monday?
3. How many units of electricity have been used?
4. In how much time these units have been used?
5. If the rate is Rs. 5 per unit, what is the cost of electricity used during this time?

Consider the circuits given below:

1. In which circuit are the lamps dimmest?
2. In which circuit or circuits are the lamps of equal brightness to the lamps in circuit?
3. Which circuit gives out the maximum light?

State whether the following statements are true or false:
According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers.

State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.

Give examples of different proteins formed in various parts of our body from amino acids:

Explain glycolysis in detail.

How are the food stuffs and their nutrient contents useful for body?

What is respiration? How does it occur?