Clouds float in atmosphere because of their low

(a)

density

(b)

pressure

(c)

velocity

(d)

mass

In the sound wave produced by a vibrating turning fork as shown in the diagram, half the wave length is represented by:

(a)

BD

(b)

AB

(c)

AE

(d)

DE

The Big Bang occurred ________ years ago.

(a)

13.7 billion

(b)

15 million

(c)

15 billion

(d)

20 million

Carbon forms large number of organic compounds due to

(a)

Allotropy

(b)

Isomerism

(c)

Tetravalency

(d)

Catenation

Plastic resin codes are shown as three chasing arrows in a ______________ with a number in the middle or letters (an acronym of that plastic type).

(a)

Logo

(b)

Recycling symbol

(c)

Square

(d)

Triangle

The groups responsible for the colour of an organic compound is called

(a)

isotopes

(b)

auxochrome

(c)

chromogen

(d)

chromophore

Increased amount of ___________ in the atmosphere, results in greenhouse effect and global warming

(a)

carbon monoxide

(b)

sulphur dioxide

(c)

nitrogen dioxide

(d)

carbon dioxide

Which one of the following is not an Indian major carp?

(a)

Rohu

(b)

Catla

(c)

Mrigal

(d)

Singhara

The major constituent of vinegar is

(a)

citric acid

(b)

acetic acid

(c)

oxalic acid

(d)

hydrochloric acid

Find out the part that is not found in CPU?

(a)

Mother Board

(b)

SMPS

(c)

RAM

(d)

Mouse

What is solar system?

What is a satellite? What are the two types of satellites?

Who is called 'Father of Modern Organic Chemistry'?

What is the need for chemical fertilizers in crop fields?

Define Pomiculture

Assertion: The force acting on the surface of a liquid at rest, under gravity, in a container is always horizontal.
Reason: The forces acting on a fluid at rest have to be normal to the surface.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c ) If assertion is true but reason is false.
(d) If assertion is false but reason is true.

State Pascal’s law.

A body of voloume 100 cc is immersed completely in water contained in a jar. The weight of water and the jar before immersion of the body was 700 g. Calculate the weight of water and jar after immersion.

Name the physical quantity whose SI unit is ‘hertz’. Define.

A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard?
(Given g = 10 m s^–2 and speed of sound = 340 m s^–1)

Write a note on the inner planets

Why are one-time use and throwaway plastics harmful?

List some of the ways in which you could save water in your home and school?

What is the nutritional importance of fish liver oils? Name any two marine fishes which yield these oils.

What is triple antigen? Mention the disease which can be prevented by using the antigen.

Assertion: A sleeping mattress is so designed that when you lie on it, a large area of your body comes in its contact.
Reason: This reduces the pressure on the body and sleeping becomes comfortable.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c ) If assertion is true but reason is false.
(d) If assertion is false but reason is true.

1. If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.

2. List the applications of sound.

1. Discuss the benefits of ISS.

2. What is catenation? How does carbon form catenated compounds?

1. Draw the cell diagram of Daniel cell. Give its reactions.

2. Explain carbon cycle with the help of a flow chart?

1. Enumerate the advantage of hydroponics.

2. Some human diseases are transmitted only when the blood of a patient comes in close contact with the blood of a healthy person. In one such disease, there is a progressive decrease in WBC of the patient.
   a. Name the disease and its causative agent.
   b. Name the type of WBC affected during infection.
   c. How does the blood of a patient come in contact with blood of healthy patient?
   d. Suggest three methods that help in preventing such infection.