English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Explain why the image distance in the eye does not change when we change the distance of an object from the eye? 

Write the molecular formula of the 2^nd and 3^rd member of the homologous series whose first member is ethene. 

Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw the electron-dot structure of the product and also state the nature of the bond formed between both the elements.

2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.

Which effect of current can be utilised in detecting a current carrying wire concealed in a wall? 

Name the scientist who discovered the magnetic effect of current.

Fill in the following blank with suitable words: 

The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.

Fill in the following blank with suitable words:

 If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.

Fill in the following blank with suitable words: 

 If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a ........... pole.

Describe some experiment to show that the magnetic field is associated with an electric current. 

What is Maxwell's corkscrew rule? For what purpose is if used?

How does control and coordination take place in plants? How does it differ from that in animals?

If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:

(a) west pole
(b) south pole
(c) north pole
(d) east pole

The magnetic effect of current was discovered by:

(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday

For the coil in the diagram below, when the switch is pressed:

(a) what is the polarity of end A?
(b) which way will the compass point then?    

The direction of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below:  

 What is the polarity of end X?

What is the polarity of end Y?   

Name and state the rule which you have used to determine the polarities. 

Name one device which works on the magnetic effect of current.

 What device reverses the current?

Which way does the wire in the diagram below  tend to move? 

Name the two systems of control and coordination in higher animals.