Q1MCQ
Chemical Reactions and EquationsWhich of the following is NOT a characteristic of a balanced chemical equation?
Q2MCQ
Acids, Bases and SaltsThe pH of a solution is 3. Which of the following best describes it?
Q3Assertion-Reason
Acids, Bases and SaltsAssertion (A)
When an acid is added to water, heat is released.
Reason (R)
The process of dissolving an acid in water is highly exothermic.
Q4MCQ
Metals and Non-metalsWhich metal burns with a dazzling white flame when ignited in air?
Q5Assertion-Reason
Metals and Non-metalsAssertion (A)
Aluminium is called an amphoteric metal.
Reason (R)
Aluminium oxide reacts with both acids and bases to form salts.
Q6Assertion-Reason
Carbon and its CompoundsAssertion (A)
Carbon forms 4 bonds with other atoms.
Reason (R)
Carbon has 4 valence electrons and needs 4 more electrons to complete its octet.
Which process takes place in the chloroplast of plant cells?
Q8Assertion-Reason
Life ProcessesAssertion (A)
In aerobic respiration, glucose is completely oxidised to CO₂ and water.
Reason (R)
Aerobic respiration requires oxygen as the terminal electron acceptor.
Q9MCQ
Control and CoordinationImpulse in a reflex action travels along the path:
Q10MCQ
How do Organisms Reproduce?Which of the following is an example of vegetative propagation?
Q11MCQ
Heredity and EvolutionIn a Mendelian cross between pure tall (TT) and dwarf (tt) plants, the ratio of tall to dwarf in the F₂ generation is:
Q12Assertion-Reason
Heredity and EvolutionAssertion (A)
Fossils provide evidence for biological evolution.
Reason (R)
Fossils are the preserved remains or impressions of organisms that lived in the past, showing how life has changed over time.
Q13MCQ
Light — Reflection and RefractionA convex lens of focal length 10 cm forms an image of an object placed 30 cm from it. The image distance is:
Q14Assertion-Reason
Light — Reflection and RefractionAssertion (A)
The image formed by a convex mirror is always virtual and erect.
Reason (R)
Reflected rays from a convex mirror always diverge and appear to come from a point behind the mirror.
Q15MCQ
The Human Eye and the Colourful WorldIn the human eye, the image of a distant object is formed on the:
Three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:
Q17MCQ
Magnetic Effects of Electric CurrentThe direction of the induced current in a conductor moving in a magnetic field is determined by:
Q18Assertion-Reason
Magnetic Effects of Electric CurrentAssertion (A)
A soft iron core is used in an electromagnet.
Reason (R)
Soft iron is easily magnetised and demagnetised, making the electromagnet easy to switch on and off.
Q19Assertion-Reason
Our EnvironmentAssertion (A)
Ozone (O₃) in the stratosphere is essential to life on Earth.
Reason (R)
Stratospheric ozone absorbs harmful ultraviolet (UV) radiation from the sun.
