Electric current is a ______quantity

(a)

base

(b)

supplementary

(c)

derived

(d)

professional

SI unit of temperature is __________

(a)

celsius

(b)

fahrenheit

(c)

kelvin

(d)

ampere

Amount of substance is

(a)

directly proportional to the number of atoms

(b)

inversely proportional to the number of atoms

(c)

directly proportional to the square of number of atoms

(d)

inversely proportional to the square of number of atoms

Luminous intensity is the intensity of ________

(a)

Laser light

(b)

UV light

(c)

visible light

(d)

IR light

Which one of the following devices is used to measure electric current

(a)

(b)

(c)

(d)

Which of the following statements  is wrong?

(a)

Approximation gives accurate value

(b)

Approximation simplifies the calculation

(c)

Approximation is very useful when little information is available

(d)

Approximation gives the nearest value only

Which of the following has curved reflecting surface?

(a)

plane mirrors

(b)

spherical mirrors

(c)

simple mirrors

(d)

None of the above

The spherical mirror with a reflecting surface curved inward is called

(a)

convex mirror

(b)

concave mirror

(c)

curved mirror

(d)

None of the above

The centre of a sphere of which the reflecting surface of a spherical mirror is a part is called

(a)

pole

(b)

centre of curvature

(c)

cradius of curvature

(d)

aperture

The spherical mirror used as a rear view mirror in the vehicle is

(a)

concave mirror

(b)

convex mirror

(c)

plane mirror

(d)

None of the above

The Pictorial symbol for water given by the alchemists was

(a)

(b)

(c)

(d)

Which one of the element name not derived from planet?

(a)

Plutonium

(b)

Neptunium

(c)

Uranium

(d)

Mercury

Symbol of Mercury is

(a)

Ag

(b)

Hg

(c)

Au

(d)

Pb

A form of non-metal which has high ductility is

(a)

nitrogen

(b)

oxygen

(c)

chlorine

(d)

carbon

Which one of metal possess low tensile strength?

(a)

Silver

(b)

Copper

(c)

Zinc

(d)

Aluminium

The property which allows metals to be hammered into their sheets is ___________

(a)

ductility

(b)

malleability

(c)

conductivity

(d)

tensile strength

Pencil lead contains

(a)

graphite

(b)

diamond

(c)

aluminium

(d)

sulphur

Molecule ______ D. smallest unit of a substance

(a)

1 - A, 2 - C, 3 - B, 4 - D

(b)

1 - C, 2 - A, 3 - B, 4 - D

(c)

1 - D, 2 - C, 3 - B, 4 - A

(d)

1 - B, 2 - C, 3 - A, 4 - D

Identify the state of matter based on the arrangement of the molecules.

(a)

A - gas, B - solid, C – liquid

(b)

A - Liquid, B - solid, C – Gas

(c)

A - gas, B - solid, C - liquid

(d)

A - Liquid, B - Gas, C - Solid

Assertion: The SI system of units is the suitable system for measurements.
Reason: The SI unit of temperature is Kelvin.
a. Both assertion and reason are true and reason is the correct explanation of the assertion.
b. Both assertion and reason are true but reason is not the correct explanation of the assertion.
c. Assertion is true, but reason is false.
d. Both assertion and reason are false.

Assertion: Avogadro’s number is the number of atoms in one mole of substance.
Reason: Avogadro’s number is a constant
a. If both assertion and reason are true and reason is the correct explanation of the assertion.
b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
c. Assertion is true, but reason is false.
d. Assertion is false, but reason is true.

Metals are generally good conductors of electricity, but not good conductors of heat.

(a) True

(b) False

Gallium metal is in solid state at or just above room temperature.

(a) True

(b) False

Compounds can be made up of one atom.

(a) True

(b) False

Convert 80°C into kelvin

Convert 300 K into celsius.

If 2 coulomb of charge flows through a circuit for 10 seconds, calculate the current.

Convert 60° into radian.

What is ductility?

Write the constituent elements and their symbols for the following compounds
a) Carbon monoxide
b) Washing soda

What are the differences between Plane angle and solid angle?

What are errors?

Your friend was absent to school yesterday. You are enquiring about his absence. He told that he had fever and it was measured to be 100^oC. Is it possible to have 100^oC fever? If he is wrong, try to make him understand.

Define focal length?

Tabulate four points of difference between metals and non-metals.

Define tensile strength.

Why are utensils made up of aluminium and brass?

What is reflection? Write short notes on regular and irregular reflection?

Explain the working of a periscope.

What is dispersion? Explain in detail.

Write a short note on common human diseases caused by micro organisms.

How can we improve the beneficial bacterial count in human beings?