The unit of heat is

(a)

newton

(b)

joule

(c)

volt

(d)

celsius

An iron ball at 50°C is dropped in a mug containing water at 50^o C. The heat will

(a)

flow from iron ball to water

(b)

not flow from iron ball to water or from water to iron ball

(c)

flow from water to iron ball

(d)

increase the temperature of both

The device which converts chemical energy into electrical energy is

(a)

fan

(b)

solar cell

(c)

cell

(d)

television

Formation of curd from milk is

(a)

a reversible change

(b)

a fast change

(c)

an irreversible change

(d)

an undesirable change

____________ is the percentage of nitrogen in air.

(a)

78%

(b)

21%

(c)

0.03%

(d)

1%

Nitrogen is used in the food packaging industry because it ________________

(a)

provides colour to the food

(b)

provides oxygen to the food

(c)

adds proteins and minerals to the food

(d)

keeps the food fresh

The unit of measurement used for expressing dimension (size) of cell is _________

(a)

centimeter

(b)

millimeter

(c)

micrometer

(d)

meter

Breakdown of food into smaller molecules in our body is known as

(a)

Muscle contraction

(b)

Respiration

(c)

Digestion

(d)

Excretion

Which one of the following is an input device?

(a)

Speaker

(b)

Keyboard

(c)

Monitor

(d)

Printer

Which one of the following is an example for wireless connections

(a)

Wi-Fi

(b)

Electric wires

(c)

VGA

(d)

USB

Make a list of electrical equipments at home which we get heat from.

What is temperature?

What is thermal expansion?

In the given circuit diagram, which of the given switch(s) should be closed. So that only the bulb A glows.

Circle the odd one out. Give reason for your choice.
Switch, Bulb, Battery, Generator.

Assertion (A): It is very easy for our body to receive electric shock.
Reason (R): Human body is a good conductor of electricity.
a. Both A and R are correct and R is the correct explanation for A.
b. A is correct, but R is not the correct explanation for A.
c. A is wrong but R is correct.
d. Both A and R are correct and R is not the correct explanation for A.

What kind of a change is associated with decaying of a plants?

You are given some candle wax. Can you make a candle doll from it? What kind of change is this?

What is a solution?

What will happen if we remove the fish from the aquarium and keep it (with green plants) in a dark place?

How do the roots of land plants get oxygen for breathing?

What should be done if the clothes of a person catch fire accidentally? Why?

What type of cells do we have?

What are the organelles found only in plant cell?

Give any three examples of eukaryotic cell?

Describe about skeletal system.

Write the functions of epiglottis.

Define the term "Trachea".

Name the parts of a computer.

Bring out any two differences between input and output devices.

What happen when paper is burnt? Explain.

Biscuits kept open on a plate during monsoon days lose its’ crispness. Why?

Write about the contribution of Robert Hooke in cell biology.

List out the functions of the human skeleton.

When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?

Rahul wants to make an electric circuit. He has a bulb, two wires, a safety pin and a piece of copper. He does not have any electric cell or battery. Suddenly he gets some idea. He uses a lemon instead of a battery and makes a circuit. Will the bulb glow?

Why is atmosphere essential for life on earth?

Why do we hiccup and cough sometimes when we swallow food?