Home
Class 8
PHYSICS
Assertion : Parts of car and bicycle are...

Assertion : Parts of car and bicycle are made iron with chromium coating. Reason : Chromium does not corrode and resist scratches.

A

If both assertion and reason are true and reason is the correct explanation of the assertion.

B

If both assertion and reason are true, but the reason is not the correct explanation of the assertion.

C

If the assertion is true, but the reason is false.

D

If the assertion is false, but the reason is true.

Text Solution

Verified by Experts

Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • Electricity

    SURA PUBLICATION|Exercise Example|63 Videos

  • Force and Pressure

    SURA PUBLICATION|Exercise Exercise|56 Videos

Similar Questions

Explore conceptually related problems

Assertion: Bending a wire does not affect electrical resistance. Reason: resistance of wire is proportional to resistivity of material.

Assertion : Transgenic plants having virus coat protein gene, express resistance to that virus and other related varieties Reason : Coat protein gene interferes with uncoating of viruses inside the plant cells.

Knowledge Check

  • Assertion : Galvanising is the process of coating iron and steel with metallic zinc. Reason : Highly resistant to rusting and corrosion.

    A
    Both (A) and (R ) are true and (R ) is the correct explanation of (A).
    B
    Both (A) and (R ) are true and (R ) is not the correct explanation of (A).
    C
    (A) true but (R ) false.
    D
    Both (A) and (R ) are false.

  • Assertion : When the car engine is started with headlights turned on, they sometimes become bright. Reason : A galvanometer is extensively useful to compare the potential difference between various parts of the circuit.

    A
    Assertion and Reason are correct and Reason is the correct explanation of Assertion.
    B
    Assertion and Reason are true but Reason is the false explanation of the Assertion.
    C
    Assertion is true but Reason in False.
    D
    Assertion is false but Reason is true.

  • Assertion : Potassium -di - chromate is a powerful oxidising agent acidic medium Reason : The oxidation state of chromium changes from Cr^(6) + to Cr^(3+)

    A
    both assertion and reason are true reason is the correct explanation of the assertion .
    B
    both assertin and reason are true but reason is not correct explanation of the assertion
    C
    Assertion is true but reason is false
    D
    Both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

    Assertion (A) : Heart wood is the dead part of wood . Reason (R ) : It resists microorganisims

    Assertion (A) : Magnesium is used in sacrificial protection method to prevent corrosion. Reason (R ) : Magnesium is more reactive than iron. When it is coated on the articles made of steel, it sacrifices itself to protect steel.

    Assertion : Aluminothermic process is the extraction of chromium from chromic oxide. Reason : Alumina has a high melting point.

    Assertion (A): SLF promotes vigorous growth and provide resistance against diseases. Reason (R): SLF is made from kelp containing more then 70 minerals.

    Home
    Profile