A compound ‘Z’ with the formula H 2 O is essential for all known forms of life. Compound (Z) contains

One H–O single bond and one O=O double bond

One H–H single bond and one O=O double bond

Read the given passage carefully and fill in the blanks by selecting an appropriate option. In an electric circuit, the (i) is the component that provides energy to the circuit. The (ii) is the component that uses electrical energy to do work. (iii) is used to control the flow of current. (iv) provides a path for the current to flow. If there is a break in the (v) , the circuit will not work.

Resistor Bulb Switch Wire Resistor

Bulb Switch Wire Battery Battery

Switch Battery Wire Bulb Switch

Read the following paragraph about forces and select the incorrect statement regarding them. Forces are interactions that cause objects to accelerate or deform. They can be classified as contact forces, such as friction and tension, or non-contact forces, such as gravity and magnetic forces. Newton's laws of motion describe the behavior of forces in relation to the motion of objects. Forces are vector quantities, meaning they have both magnitude and direction.

Forces cause objects to accelerate or deform.

Gravity is an example of a non-contact force.

Newton's laws of motion describe the behavior of forces.

Select the incorrect statement.

The Earth's atmosphere is primarily composed of nitrogen and oxygen.

The ozone layer is found in the stratosphere and helps protect Earth from ultraviolet radiation.

Carbon dioxide is a greenhouse gas that contributes to global warming.

Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen.

A mineral ‘W’ with the formula NaCl is commonly used in cooking. Compound (W) contains

Ionic bonds between Na + and Cl -

Covalent bonds between Na and Cl

Metallic bonds between Na and Cl

Read the given passage carefully and fill in the blanks by selecting an appropriate option. In a nuclear reactor, (i) are used to slow down the neutrons. (ii) is used as a fuel. The (iii) controls the rate of the nuclear reaction by absorbing neutrons. The (iv) is used to cool the reactor core and transfer heat. The entire process is enclosed within a (v) .

Control rods Uranium Moderator Coolant Reactor vessel

Moderator Uranium Control rods Coolant Reactor vessel

Coolant Plutonium Moderator Control rods Containment building

Moderator Thorium Control rods Coolant Containment building

Read the given paragraph about atoms and select the incorrect statement regarding them. Atoms are the smallest units of matter that retain the properties of an element. They consist of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells. Atoms combine to form molecules through chemical bonds, which can be ionic or covalent. Elements are defined by the number of protons in their atoms.

Atoms are the smallest units of matter that retain the properties of an element.

Electrons are found in energy levels or shells around the nucleus.

Atoms combine to form molecules through chemical bonds.

Neutrons have a positive charge.

Select the incorrect statement.

Metals are good conductors of electricity.

Non-metals generally have high melting and boiling points.

Aluminum is a metal that is lightweight and has good strength.

Sodium chloride is an example of an ionic compound.

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