The size of an air bubble rising up in water

(a)

decreases

(b)

increases

(c)

remains same

(d)

may increase or decrease

Sound travels in air:

(a)

if there is no moisture in the atmosphere.

(b)

if particles of medium travel from one place to another.

(c)

if both particles as well as disturbance move from one place to another.

(d)

if disturbance moves.

Ceres is a _______.

(a)

Meteor

(b)

Star

(c)

Planet

(d)

Astroid

Which of the following plastic items are banned by the Government of Tamil Nadu as of 1st January 2019?

(a)

Plastic sheets

(b)

Plastic tea cups

(c)

Plastic water packets

(d)

All the above

The lead pencil contains

(a)

Graphite

(b)

Diamond

(c)

Lead

(d)

Charcoal

The age of a dead animal can be determined by using an isotope of ____________

(a)

carbon

(b)

iodine

(c)

phosphorous

(d)

oxygen

Identify the incorrect statement with respect to adaptations of earthworm.

(a)

Earthworm has a stream lined body with no antennae or fins.

(b)

Each segment of earthworm has setae.

(c)

Many earthworms become inactive in a process called hibernation, during winter season.

(d)

Earthworms remain in its burrow during day time, to avoid sunlight.

Mehsana is a breed of

(a)

Cow

(b)

Buffalo

(c)

Goat

(d)

Sheep

The most fatal form of Malaria is caused by

(a)

Plasmodium ovale

(b)

Plasmodium falciparum

(c)

Plasmodium malariae

(d)

Plasmodium vivax

Which of the following is correct?

(a)

Free and Open source

(b)

Free and Traditional software

(c)

Passive and Open source

(d)

Passive and Traditional source

Define orbital velocity.

Define time period of a satellite.

Which three resin codes are unsafe?

What is Chemotherapy?

Define Apiculture

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.

Assertion: Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking in the ground.
Reason: Pressure is directly proportional to the area in which it is acting.
(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.

What is meant by atmospheric pressure?

A block of wood of weight 200 g floats on the surface of water. If the volume of block is 300 cm³ calculate the upthrust due to water.

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)

What factors have made life on Earth possible?

What are saturated and unsaturated compounds called?

What is adaptation?

How is division of labour observed in honey bees?

Name the vector of the malarial parasite. Mention the species of malarial parasite which cause malignant and fatal malaria.

How does a fish manage to rise up and move down in water?

Explain the working of human ear with diagram.

Discuss the benefits of ISS.

What are the chemical reactions of carbon? 

Batteries that are used in mobile phone can be recharged. Likewise, can you recharge the batteries used in watches? Justify your answer.

Describe the processes involved in the water cycle.

What are the sources of organic resources for vermicomposting?

Suggest the immunization schedule for a new born baby till 12 months of age. Why it is necessary to follow the schedule?