Physics
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Jun 6, 2022
An Indian rubber cord L metre long and area of cross-section A metre 2 is suspended vertically. Density of rubber is...
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Jun 6, 2022
(a) Angle of contact is acute (b) Cohesion force is more (c) Adhesion force is more (d) Density of mercury...
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Jun 6, 2022
(a) 4o C (b) 25o C (c) 50o C (d) 75o C Ans. d (10)
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Jun 6, 2022
(a) 2 : 3 (b) 3 : 4 (c) 3 : 2 (d) 6 : 1 Answer-b (14)
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Jun 6, 2022
(a) 0.1 J (b) 0.2 J (c) 10 J (d) 20 Answer-a (15)
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Jun 6, 2022
(a) Horizontal (b) Almost vertical (c) Concave (d) Convex Ans. d (6)
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Jun 6, 2022
(a) Energy density =(1/2)×strain×stress (b) Energy density =(strain) 2 × volume (c) Energy density = (strain)× volume (d) Energy density =...
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Jun 6, 2022
The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface...
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Jun 6, 2022
(a) Increased kinetic energy (b) Increased potential energy (c) Decreased kinetic energy (d) Decreased potential energy Answer-b (14)
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Jun 6, 2022
(a) 75 joule (b) 60 joule (c) 50 joule (d) 100 joule Answer-a (7)
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Jun 6, 2022
25. The work per unit volume to stretch the length by 1% of a wire with cross sectional area of ...
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Jun 6, 2022
(a) Increase (b) Decrease (c) Remain unchanged (d) None of the above Ans. a (42)
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Jun 6, 2022
24.A wire of length 50 cm and cross sectional area of 1 sq. mm is extended by 1 mm. The...
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Jun 6, 2022
(a) Attraction (b) Repulsion (c) Attraction or repulsion (d) None of the above Ans. a (3)
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Jun 6, 2022
20.K is the force constant of a spring. The work done in increasing its extension from l1 to l2 will...
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Jun 6, 2022
(a) Cohesive force of oil>> adhesive force between oil and glass (b) Cohesive force of oil > cohesive force of...
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Jun 6, 2022
(a) 2 TL (b) 4 TL (c) 8 TL (d) 10 TL Ans. (c) Force on each side =2TL (due...
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Jun 6, 2022
19.When a force is applied on a wire of uniform cross-sectional area 3×10-6 m2 and length 4m, the increase in...
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Jun 6, 2022
(a) Increases with area (b) Decreases with area (c) Increase with temperature (d) Decrease with temperature Ans. d (8)
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Jun 6, 2022
(a) Solids, liquids and gases (b) Liquids (c) Gases (d) Matter Ans. b (8)
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Jun 6, 2022
(a) 30 dynes (b) 60 dynes (c) 750 dynes (d) 750 π dynes Ans. d (47)
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Jun 6, 2022
(a) Y×(Strain2/Volume) (b) Stress × Strain × Volume (c) (Stress2×Volume) / (2Y) (d) (1/Y) × Stress × Strain × Volume Answer-c (12)
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Jun 6, 2022
(a) Only on the cohesive force of liquid molecules (b) Only on the adhesive force between the molecules of glass...
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Jun 6, 2022
(a) Dancing of a camphor piece over the surface of water (b) Small mercury drop itself becomes spherical (c) A...
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Jun 6, 2022
(a) C.F. for water > A.F. for water and oil (b) C.F. for oil > A.F. for water and oil (c) C.F. for...
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Jun 6, 2022
21. When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches...
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Jun 6, 2022
(a) Force of attraction between hair (b) Surface tension (c) Viscosity of water (d) Characteristic property of hairs Ans. b...
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Jun 3, 2022
(a) water is absorbed by the coating (b) Cohesive force becomes greater (c) Water is not scattered away by the...
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Jun 3, 2022
(a) Surface tension (b) Less weight (c) Upthrust of liquid (d) None of the above Ans. a (13)
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Jun 3, 2022
(a) Fl/2AL ...
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Jun 3, 2022
(a) Force of surface tension is equal and opposite to the force of gravity (b) Force of surface tension predominates...
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Jun 3, 2022
(a) Elastic membrane is formed on water due to property of surface tension (b) Spiders and insects are lighter (c) Spiders...
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Jun 3, 2022
(a) Increase in the saturated vapour pressure of water (b) Root mean square velocity of air molecules inside the bubble...
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Jun 3, 2022
(a) 0°C (b) 277 K (c) 370°C (d) Slightly less than 647 K Ans. c,d (14)
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Jun 3, 2022
(a) It will remain on it as a sphere (b) It will spread as a thin layer (c) It will...
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Jun 3, 2022
(a) Increases (b) Decreases (c) Remains the same (d) Increases then decreases Ans. b (13)
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Jun 3, 2022
(a) Chemicals of soap change (b) It increases the surface tension of the solution (c) It absorbs the dirt (d) ...
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Jun 3, 2022
(a) Frictional forces between molecules (b) Cohesive forces between molecules (c) Adhesive forces between molecules (d) Gravitational forces Ans. b...