There is no deviation in the path of ray of light when it passes through -------------- of a lens.

• A) Pole
• B) Centre of curvature
• C) Optical centre
• D) Focus

The genes of chromosomes consist of ________.

• A) Genesis
• B) Deoxyribonucleic acid
• C) Dominant genesis
• D) Alleles

The purest form of iron produced when impurities are removed is known as:

• A) Steel
• B) Wrought Iron
• C) Pig Iron
• D) Cast Iron

What is the main job of the red corpuscles in the blood?

• A) To clot blood
• B) To transport oxygen to the body's cells and carry away carbon dioxide from the cells
• C) To transport carbon dioxide to the body's cells and carry away oxygen from the cells
• D) To fight disease

The reaction of acid-base in which salt and water is formed is known as:

• A) Hydrolysis
• B) Neutralization
• C) Hydration
• D) Oxidation

A -----------mirror is used by dentists to focus light on the tooth of a patient:

• A) Concave
• B) Cylindrical
• C) Plane
• D) Convex

Metals are good conductor of heat and electricity because metals_______.

• A) Have higher electronegativity
• B) Are good oxidizing agent
• C) Lose electrons easily
• D) Gain electrons easily

The fuel efficiency of a car is 30% and output is 750 J. What is the total energy used by the car?

• A) 750 J
• B) 300 J
• C) 2500 J
• D) 2250 J

Which of the following is not an electromagnetic wave?

• A) X-rays
• B) Sound
• C) Ultraviolet
• D) Visible light

When a horse pulls a wagon the horse moves forward due to the force:

• A) of the horse on the ground
• B) of the ground on the horse
• C) of the horse on the wagon
• D) of the wagon on the horse

Which of the following group contain alkaline earth metals

• A) Group 7
• B) Group 1
• C) Group 2
• D) Group 3

Which line correctly represents advantages and disadvantages of Friction
Advantage Disadvantage

• A) it allows us to hang it increases temperature pictures on walls
• B) it wastes energy it allows us to walk on the ground
• C) it allows us to turn vehicles it makes engines along bends run smoothly in roads without noise
• D) it allows us to it allows us to turn walk on the ground vehicles along bends in roads

A mass is projected vertically downwards. Which line could represent the correct energy conversions?
K.E. Gravitational PE Total Energy

• A) increases decreases does not change
• B) decreases increases does not change
• C) increases increases increases
• D) decreases decreases decreases

Of the three variables (i) speed, (ii) velocity and (iii) direction. Linear acceleration can change

• A) (i) and (ii)only
• B) (i) only
• C) (i), (ii) and (iii)
• D) (ii) and (iii)only

If under the action of a force on an accelerating body, the work done is maximum the direction of force and th displacement would be ………. to each other:

• A) opposite
• B) insufficient information for an answer
• C) perpendicular
• D) identical

_____ Molecule has a polar covalent bond?

• A) NaCl
• B) HCl
• C) none of these
• D) H2

A man carrying a weight on his head walking on road from one place to another. But total work done is zero in this example because ________.

• A) Force is zero
• B) Force is perpendicular to displacement
• C) Displacement is zero
• D) All of above

Which of the metal exists in Liquid state at room temperature?

• A) Al (Aluminum)
• B) Hg (Mercury)
• C) Fe (Iron)
• D) Cu (Cupper)

In cold areas during winters pipes which are not properly insulated may burst due to:

• A) real expansion of water
• B) anomalous expansion of water
• C) expansion of pipes
• D) apparent expansion of water

The direction of the change of momentum is the same as the:

• A) mass
• B) force
• C) displacement
• D) speed