1.No matter how far you stand from a mirror, your image appears erect. The
mirror is likely to be?
2. Calculate the number of electrons constituting one coulomb of charge.
3. Define the term “Induced current”.
4. Assertion(A): If the rays are diverging after emerging from a lens; the lens must
be concave.
Reason(R): The convex lens can give diverging rays.
(a) Both Assertion & Reason are True & Reason is a correct explanation of the
Assertion.
(b) If both Assertion & Reason are True but Reason is not a correct explanation of
the Assertion.
(c) If Assertion is True but the Reason is False.
(d)Both Assertion and Reason is False
5. Na & Cl ions attract each other and are held by strong ________of attraction to
exist as NACl.
OR
Sodium chloride does not exist as molecules but aggregates of ________ ions.
6. Name the factors responsible for carbon forming large number of stable
compounds.
7. In the following Question, the Assertion and Reason have been put
forward. Read the statements carefully and choose the correct alternative
from the following:
(a)Both the Assertion and the Reason are correct and the Reason is the correct
explanation of the Assertion.
(b)The Assertion and the Reason are correct but the Reason is not the correct
explanation of the Assertion.
(c)Assertion is true but the Reason is false.
(d)The statement of the Assertion is false but the Reason is true.
Answers
Answer:
If your phone original
try to copy this?
⃢⃢⃢⃢⃢⃢⃢
Answer
1. d.>either plane or convace
2. One electron possesses a charge of 1.6 ×10-19C, i.e., 1.6 ×10-19C of charge is contained in 1 electron.
∴ 1 C of charge is contained in 1/1.6 x 10-19 = 6.25 x 1018 = 6 x 1018
Therefore, 6 x 1018 electrons constitute one coulomb of charge.
3. The current induced in a conducting loop that is exposed to a changing magnetic field is known as induced current.
4. the solution is in the image..
5. Sodium and chloride ions, being oppositely charged, attract each her and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaC1). It should be noted that sodium chloride does exist as molecules but aggregates of oppositely charged ions.
OR
It should be noted that sodium chloride does exist as molecules but aggregates of oppositely charged ions. Let us see the formation of one more ionic compound, magnesium chloride
6. Carbon forms a large number of compounds because of the following reasons: (a) Tetravalency: Carbon atoms readily form covalent bonds with the other atoms. (b) Catenation: Two carbon atoms readily form covalent bonds and this bond is more stable than the bonds formed by the other elements.
