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806. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : A gas filled balloon stops rising after it has attained a certain height in the sky. 2. Reason (R) : At the highest point, the density of air is such that the buoyant force on the balloon just equals its weight.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
807. Which of the following gases is used for regrigeration ?
A. Chlorine
B. Sulphur dioxide
C. Phosphine
D. Ammonia
Explanation:
808. In the process of cleaning, soap functions by : 1. changing hard water into soft water2. reducing oily and greasy dirt into colloidal particles3. converting the dirt to lather and water soluble particles 4. increasing the cleansing properties of water
A. 1 and 4
B. 2 only
C. 3 only
D. 4 only
Explanation:
809. Sun appears reddish during the rising and setting time because
A. the atmosphere absorbs short wavelenghts more than long wavelengths.
B. red light is emitted in huge amount by it.
C. light of shorter wavelengths are scattered to a greater extent than the longer wavelengths by the atmosphere.
D. the atmosphere absorbs long wavelengths more than short wavelenghts.
Explanation:
810. The type of glass used in making lenses and prisms is :
A. soft glass
B. pyrex glass
C. jena glass
D. flint glass
Explanation:
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