MCQ & Assertion-Reason Practice
Practice MCQs and Assertion-Reason questions for CBSE Class 10 board exams. Select an answer to check — explanations reveal after submission.
A convex lens of focal length 10 cm forms an image of an object placed 30 cm from it. The image distance is:
Three resistors of 2Ω, 3Ω, and 6Ω are connected in parallel. The equivalent resistance is:
Assertion (A)
Carbon forms 4 bonds with other atoms.
Reason (R)
Carbon has 4 valence electrons and needs 4 more electrons to complete its octet.
The pH of a solution is 3. Which of the following best describes it?
Which of the following is NOT a characteristic of a balanced chemical equation?
Assertion (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.
Impulse in a reflex action travels along the path:
In the human eye, the image of a distant object is formed on the: