Download App

Science Assertion - Reasoning (1 Marks)

MODEL PAPER 9 · CBSE STD 10 (CBSE - English Medium). 4 questions.

Questions

Assertion - Reasoning (1 Marks)

🎯

Test yourself on this topic

4 questions · timed · auto-graded

Question 11 Mark
Assertion (A): Copper spoon is used to stir silver nitrate solution.
Reason (R): Copper is less reactive than silver
Answer
(c) A is true but R is false
Explanation: Silver's reactivity according to the reactivity series is lesser than that of copper (Cu). So, we cannot stir the
solution as the solution would be displaced by copper. We should instead use a glass rod for this. Thus assertion is true, but
reason is false.
View full question & answer→
Question 21 Mark
Assertion (A): Sexual reproduction increases genetic diversities and plays a role in origin of new species.
Reason (R): Sexual reproduction involves the formation of gametes and fusion of gametes.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Sexual reproduction involves two parents that result in offspring that are not identical to the parents. It causes
variations; which are essential for evolution as well as the survival of species under unfavorable conditions.
View full question & answer→
Question 31 Mark
Assertion (A): A proton moves horizontally towards a vertical long conductor having an upward electric current. It will deflect vertically downward.
Reason (R): Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the
proton will be towards the right. Hence the force $\vec{F}=q \vec{\nu} \times \vec{B}$ will deflect the proton vertically downward.
Answer
(a) Both A and R are true and R is the correct explanation of A
Explanation: Both A and R are true and R is the correct explanation of A
View full question & answer→
Question 41 Mark
Assertion (A): The energy which passes to the herbivores does not come back to autotrophs. .
Reason (R): The flow of energy in a food chain is unidirectional.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: The energy flow is unidirectional. The energy that autotrophs absorb from the Sun does not return, and the
energy that goes to herbivores does not go back to the autotrophs. It is no longer accessible to the previous level as it progresses through the various trophic levels.
View full question & answer→
Generate Paper FreeAll MODEL PAPER 9 topics
Assertion - Reasoning (1 Marks) - Science STD 10 Questions - Vidyadip