Defence Exams
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Q. A ray of light strikes a plane mirror at an angle of 30 degrees to the normal. What is the angle of reflection? (2022)
Q. A rectangle has a length of 10 cm and a width of 5 cm. What is its area? (2022)
Q. A rectangle has a length of 10 cm and a width of 5 cm. What is the area of the rectangle? (2022)
Q. A rectangle has a length of 12 cm and a width of 5 cm. What is its perimeter? (2021)
Q. A rectangle has a length that is twice its width. If the perimeter is 48 cm, what is the width? (2022)
Q. A river basin has an area of 200 km². If the average rainfall is 1000 mm per year, what is the total volume of water received by the basin in a year?
Q. A river basin has an area of 200 square kilometers. If the average rainfall is 800 mm per year, how much water (in cubic meters) falls on the basin annually? (2019)
Q. A river basin has an area of 2000 km². If the average rainfall is 800 mm per year, what is the total volume of water received by the basin in cubic meters? (2000)
Q. A river basin has an area of 500 km². If the average rainfall is 800 mm per year, how much water falls on the basin in cubic meters? (2022)
Q. A river basin has an area of 500 km². If the average rainfall is 800 mm per year, what is the total volume of water received by the basin in a year? (2019)
Q. A river carries 1500 m³ of water per second. If the river's width is 25 m, what is the average depth of the river?
Q. A river flows at a rate of 5 m/s. If it takes 2 hours to travel a certain distance, what is the distance covered by the river?
Q. A river flows at a speed of 3 m/s. How far will it travel in 2 hours? (2020)
Q. A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still water, how long will it take the boat to travel 12 km upstream?
Q. A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still water, what is the speed of the boat when going upstream?
Q. A river flows at a speed of 4 km/h. If a boat travels downstream at 12 km/h, what is the speed of the boat relative to the river? (2020)
Q. A river flows through a region with a soil erosion rate of 5 tons per hectare per year. If the area of the watershed is 100 hectares, how much soil is eroded in a year?
Q. A river flows through a region with a soil retention capacity of 20% of its volume. If the river has a volume of 1000 m³, how much water can be retained by the soil? (2023)
Q. A river flows through a valley with a gradient of 1 in 1000. If the river descends 2 meters over a distance of 2000 meters, is the gradient consistent? (2023)
Q. A river flows through a valley with a gradient of 1:1000. If the river descends 2 meters over a distance of 2000 meters, is the gradient consistent? (2022)
Q. A river has a cross-sectional area of 150 m² and flows at a velocity of 4 m/s. What is the discharge of the river? (2021)
Q. A river has a depth of 4 m and a width of 10 m. If the flow velocity is 2 m/s, what is the flow rate?
Q. A river has a length of 100 km and a drainage area of 500 km². What is the average discharge per square kilometer?
Q. A river has a length of 150 km and a width of 50 m. If the average depth is 3 m, what is the approximate volume of water in the river in cubic meters?
Q. A river has a length of 150 km and a width of 50 m. What is the area of the river? (2020)
Q. A river has a length of 200 km and a width of 50 m. What is the area of the river's surface? (2021)
Q. A river has a width of 300 meters and a depth of 5 meters. What is the volume of water flowing through the river in one second if the flow speed is 2 m/s? (2020)
Q. A river has a width of 300 meters. If a boat crosses the river at a speed of 15 m/s, how long will it take to cross the river? (2020)
Q. A river is 150 km long and has an average width of 50 meters. What is the approximate area of the river?
Q. A river is 300 m wide. If a person swims across the river at a speed of 2 m/s and the river flows at 1 m/s, how long will it take to cross the river? (2020)
