Answer: A) Light Explanation: Light travels Faster than Sound.   Light : 1. Light doesn't require a medium to travel. 2. It travels in the vaccum with the speed of 1,86,000 miles per second.   Sound: 1. Sound rquire a medium. 2. It travels in the Air with the speed of 340 meters per second. 3. It travels Faster in Water than in Air. 4. It travels Faster in Steel than in Water.

Answer: D) Reliable Explanation:

Answer: B) 4 % Explanation: Imension of the duster is assumed as 5x5x7 cm3 Volume of the duster below the water layer= volume of water increased= πxrxrxh = 3.14×52×2.14 ≈ 168 cm3 Total volume of the duster = 5×5×7 = 175 cm3 Percentage of the duster part below the layer = 168×100/175 = 96% Percentage of the duster part above the layer = 4%

Answer: D) 280 Explanation: Here asked for the value of 28 tens => 28 x 10 = 280.

Answer: B) 178 cm Explanation: Area of square = 40 x 40 = 1600 sq.cm Given that the areas of Square and Rectangle are equal => Area of rectangle = 1600 Sq.cm We know that, Area of rectangle = L x B Given L = 64 cm Breadth of rectangle = 1600/64 = 25 cm Perimeter of the rectangle = 2(L + B) = 2(64+25) = 178 cm.

Answer: A) Scientist Explanation: 1. Eminent space scientist and former Indian Space Research Organisation (ISRO) Chairman Udupi Ramachandra Rao passed away due to age related ailments. He was 85. 2. He was currently serving as the chairman of the governing council of the Physical Research Laboratory in Ahmedabad. Rao served as the chairman of ISRO for 10 years from 1984-1994.

Answer: A) TRUE Explanation: We know that, Alternate Exterior Angles Theorem:: The Alternate Exterior Angles Theorem states that, when two parallel lines are cut by a transversal, the resulting alternate exterior angles are congruent . Converse of the Alternate Exterior Angles Theorem :: Converse of the Alternate Exterior Angles Theorem states that, If two lines are cut by a transversal and the alternate exterior angles are congruent, then the lines are parallel.

Answer: A) 2648 Explanation: 8000 × 33.1% = 2648