Question
What is meant by combination reaction? Explain it with a suitable example.
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Give scientific reason:
Lymph separates from the blood and remixes with the blood.
Lymph separates from the blood and remixes with the blood.
Name the type of mirror used in the following situations -
a) Headlights of a car
b) Side/rear-view mirror of a vehicle
c) Solar Furnace
a) Headlights of a car
b) Side/rear-view mirror of a vehicle
c) Solar Furnace
Explain about refractive index in detail.
Distinguish between:
Ionic compounds and Covalent compounds
Ionic compounds and Covalent compounds
Resistance of a metal wire of length 1 m is $26 \Omega$ at $20^{\circ} C$. If the diameter of the wire is 0.3 mm , what will be the resistivity of the metal at that temperature? Using Table 2 (on page 115), predict the material of the wire.
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A rainbow is an example of dispersion of sunlight. Justify this statement by explaining, with a neat labelled diagram, the formation of a rainbow in the sky. List two essential conditions for observing a rainbow.
Your father-mother are in a age-group at forty plus. On their routine blood test, some disturbance in their blood tests were reported. Your family doctor advised your father to walk regularly and consume a diet containing low sugar. Doctor insisted your mother to take 25 mg elthroxine tablet daily.
(1) From your study, what do you think about the report of the blood test of your father?
(2) Which gland is not functioning properly and which hormone is not secreted in appropriate amount in your father's body?
(3) Which gland is affected in your mother's body?
(4) Why elthroxine tablet is suggested by the doctor?
(1) From your study, what do you think about the report of the blood test of your father?
(2) Which gland is not functioning properly and which hormone is not secreted in appropriate amount in your father's body?
(3) Which gland is affected in your mother's body?
(4) Why elthroxine tablet is suggested by the doctor?
Five solutions A, B, C, D and E, when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is...
(a) neutral? (b) strongly alkaline? (c) strongly acidic ? (d) weakly acidic? (e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
(a) neutral? (b) strongly alkaline? (c) strongly acidic ? (d) weakly acidic? (e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.