In a pressure cooker, the food is cooked faster because

(a)

increased pressure lowers the boiling point

(b)

increased pressure raises the boiling point

(c)

decreased pressure raises the boiling point

(d)

increased pressure lowers the melting point

If the speed of a wave is 340 m s^-1 and its frequency is 1700 Hz, then wavelength λ for this wave in cm will be

(a)

34

(b)

20

(c)

15

(d)

0.2

Which of the following statements is correct?
A. There are eight planets in our Solar System.
B. Except Mars, all other planets revolve around the Sun in elliptical orbits

(a)

A only

(b)

B only

(c)

Both A and B

(d)

None

Plastics made of Polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS) are made of resin code ___________

(a)

2

(b)

5

(c)

6

(d)

7

The lead pencil contains

(a)

Graphite

(b)

Diamond

(c)

Lead

(d)

Charcoal

The cathode of an electrochemical reaction involves ____________

(a)

oxidation

(b)

reduction

(c)

neutralisation

(d)

catenation

Specific constituents such as nitrogen, phosphorus, suspended solids and heavy metals found in the wastewater are removed during ___________ treatment of water recycling process.

(a)

primary

(b)

tertiary

(c)

secondary

(d)

none of the above

Drones in the honey bee colony are formed from

(a)

unfertilized egg

(b)

fertilized egg

(c)

parthenogenesis

(d)

both b and c

The organ affected by jaundice is

(a)

liver

(b)

lungs

(c)

kidney

(d)

brain

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

What is solar system?

Define time period of a satellite.

Who is called 'Father of Modern Organic Chemistry'?

What is Chemotherapy?

Assertion: Pascal’s law is the working principle of a hydraulic lift.
Reason: Pressure is thrust per unit area.
(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.

Why it is easy to swim in river water than in sea water?

Calculate the apparent weight of wood floating on water if it weighs 100g in air.

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

What is meant by supersonic speed?

Write a note on the inner planets

Why are one-time use and throwaway plastics harmful?

What are the challenges faced by hydrophytes in their habitat?

Enumerate the advantages of vermicompost over chemical fertiliser.

Sanjay had an attack of chicken pox and has just recovered. The health officer of his locality says that the disease would not occur again for him. What would be the reason for this?

Explain the construction and working of a hydrometer with diagram.

Describe with diagram, how compressions and rarefactions are produced.

Write a note on orbital velocity.

Why do carbon exist mostly in combined state?

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

What is water recycling? Explain the conventional wastewater recycling treatment methods?

What are biofertilisers? Give examples. Why are biofertilisers better than other fertilizers.

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