Engineers' Day 2026 Quiz: Answer Keys | 1st to 10th Grade | Apex Edutech Solutions

0
Engineers' Day · 15 September 2026

Engineers' Day 2026 Quiz: Answer Keys



Answer keys with short explanations for all four NEP 2020 stages. Tap any question to see why the answer is correct.

Foundation Stage

Grades 1 & 2 · 25 questions · 1 mark each

Quick answer grid

Q1BQ2AQ3CQ4AQ5BQ6BQ7DQ8AQ9CQ10BQ11DQ12AQ13DQ14CQ15DQ16CQ17BQ18AQ19CQ20BQ21AQ22DQ23DQ24BQ25C

Answers with explanations (tap a question to see why)

Q1Engineers' Day is celebrated in India every year. Look at the calendar. On which date is Engineers' Day?B. 15 SeptemberWhy? ▾
Explanation: Engineers' Day is on 15 September, the birthday of Sir M. Visvesvaraya. (5 September is Teachers' Day and 14 November is Children's Day.)
Q2Engineers' Day is celebrated on the birthday of a great Indian engineer. Who is he?A. Sir M. VisvesvarayaWhy? ▾
Explanation: Sir M. Visvesvaraya was a great engineer who built dams and helped cities. 2026 marks his 165th birth anniversary.
Q3Look at the picture. Who plans and builds bridges, roads and buildings?C. EngineerWhy? ▾
Explanation: Engineers plan and build bridges, roads and buildings like the one in the picture.
Q4This child is at a building site. What should an engineer wear on the head to stay safe?A. Safety helmetWhy? ▾
Explanation: A safety helmet protects the head from falling things at a building site.
Q5Count the bricks. How many bricks are there?B. 6Why? ▾
Explanation: There are 2 rows with 3 bricks in each row. 3 + 3 = 6.
Q6Engineers design bicycles. How many wheels does this bicycle have?B. 2Why? ▾
Explanation: A bicycle has 2 wheels, one at the front and one at the back.
Q7Look at this bridge. Which shape do you see again and again in it?D. TriangleWhy? ▾
Explanation: The red bars of the bridge make triangles. Engineers use triangles because they make bridges strong.
Q8This part is used in cars, bicycles and trains. What is it called?A. WheelWhy? ▾
Explanation: It is a wheel. Wheels are round and help things roll and move easily.
Q9Sir M. Visvesvaraya built big dams. What does a dam do?C. Stores waterWhy? ▾
Explanation: The picture shows a dam holding back lots of water. A dam stores water for drinking and farming.
Q10Machines have gears inside them. Count the gears. How many are there?B. 4Why? ▾
Explanation: There are 4 gears: yellow, blue, green and red.
Q11Riya wants to find out how long her pencil is. Which tool should she use?D. RulerWhy? ▾
Explanation: A ruler is used to measure length.
Q12Look at the pattern. What comes next in the box?A. WheelWhy? ▾
Explanation: The pattern is wheel, brick, wheel, brick. So a wheel comes next.
Q13Engineers build tall buildings. Which building is the tallest?D. Blue buildingWhy? ▾
Explanation: The blue building is taller than all the others.
Q14Look at the picture. Which vehicle runs on these tracks?C. TrainWhy? ▾
Explanation: The picture shows a railway track. Trains run on railway tracks.
Q15It is dark at night. Which thing gives light inside this house?D. BulbWhy? ▾
Explanation: A bulb gives light. Engineers bring electricity to our homes so bulbs can glow.
Q16Count the windows of this house. How many windows are there?C. 5Why? ▾
Explanation: There are 3 windows on top and 2 windows below. 3 + 2 = 5. The door is not a window.
Q17Arun made a tower with 4 blocks. He adds 3 more blocks to it. How many blocks will the tower have now?B. 7Why? ▾
Explanation: 4 blocks and 3 more blocks make 7 blocks. 4 + 3 = 7.
Q18Engineers want to build a strong house here. What should they use?A. BricksWhy? ▾
Explanation: Bricks are hard and strong. Paper, ice and cotton cannot make a strong house.
Q19Engineers make traffic signals to keep us safe. Which light tells vehicles to STOP?C. RedWhy? ▾
Explanation: Red means stop. Yellow means get ready and green means go.
Q20Look at this big machine at a building site. What does it do?B. Lifts heavy thingsWhy? ▾
Explanation: This is a crane. It lifts heavy things high up at a building site.
Q21Long ago, heavy rain flooded a city on the Musi river. Sir M. Visvesvaraya planned how to keep it safe from floods. Which city is it?A. HyderabadWhy? ▾
Explanation: The picture shows the Charminar. After the 1908 Musi flood, Sir M. Visvesvaraya planned flood protection for Hyderabad.
Q22These children want to meet each other. Engineers build a bridge over the ______.D. RiverWhy? ▾
Explanation: The children are on two sides of a river. A bridge helps people cross a river.
Q23Rahul made a paper bridge for his toy car, but it fell down. What should Rahul do now?D. Try again with a better ideaWhy? ▾
Explanation: Good engineers never give up. They learn from mistakes and try again with a better idea.
Q24Traffic cones keep people safe near road work. How many cones are there?B. 3Why? ▾
Explanation: There are 3 orange cones in the picture.
Q25Engineers bring water from the tank to our kitchen through pipes. From where does the water come out?C. TapWhy? ▾
Explanation: Water comes out of a tap. The pipe carries water from the tank to the tap.

Preparatory Stage

Grades 3, 4 & 5 · 25 questions · 1 mark each

Quick answer grid

Q1CQ2AQ3CQ4BQ5DQ6CQ7BQ8AQ9CQ10DQ11AQ12BQ13DQ14DQ15BQ16AQ17CQ18BQ19DQ20AQ21CQ22BQ23AQ24DQ25B

Answers with explanations (tap a question to see why)

Q1Engineers' Day (15 September) is celebrated on the birthday of Sir M. Visvesvaraya, who was born in 1861. Which birth anniversary is celebrated in 2026?C. 165thWhy? ▾
Explanation: 2026 − 1861 = 165, so 2026 marks his 165th birth anniversary.
Q2In 1955, Sir M. Visvesvaraya received India's highest civilian award. Its medal is shaped like a peepal leaf. What is this award called?A. Bharat RatnaWhy? ▾
Explanation: The Bharat Ratna is India's highest civilian award. Sir M. Visvesvaraya received it in 1955.
Q3Sir M. Visvesvaraya was the chief engineer for the Krishna Raja Sagara (KRS) dam near Mysuru. On which river is this dam built?C. KaveriWhy? ▾
Explanation: The KRS dam is built across the Kaveri river. It is named after the Mysuru king Krishnaraja Wadiyar IV, not after the Krishna river.
Q4Sir M. Visvesvaraya designed automatic gates for dams. What do these gates control?B. The flow of waterWhy? ▾
Explanation: The gates open by themselves to let extra water out when the water rises too high, keeping the dam safe. They were first used at Khadakwasla near Pune in 1903.
Q5Both frames are pushed from the side. Which frame shape stays firm and does not change its shape easily?D. TriangleWhy? ▾
Explanation: The three sides of a triangle lock each other in place, so it does not bend out of shape. A square can be pushed into a slanted shape. That is why engineers use triangles in bridges, cranes and roofs.
Q6The pictograph shows the bridges built in a town. How many bridges were built in 2024?C. 6Why? ▾
Explanation: 2024 has 3 symbols and each symbol stands for 2 bridges. 3 × 2 = 6 bridges.
Q7The bar graph shows the number of bricks used at a building site. On which day were the most bricks used?B. TuesdayWhy? ▾
Explanation: Tuesday has the tallest bar, which shows 50 bricks. This is more than any other day.
Q8A seesaw is an example of which simple machine?A. LeverWhy? ▾
Explanation: A seesaw is a lever. It is a long plank that turns on a fixed point called the fulcrum.
Q9Which simple machine is used at the top of this well to lift the bucket of water?C. PulleyWhy? ▾
Explanation: A pulley is a wheel with a rope over it. Pulling the rope down lifts the bucket up easily.
Q10Meena must move a heavy 50 kg box up into the back of the truck. Which simple machine will make this easiest?D. Inclined plane (ramp)Why? ▾
Explanation: A ramp is an inclined plane. Pushing the box up a slope needs less force than lifting it straight up.
Q11Engineers are building a road that is 485 m long. They have finished 267 m. How much of the road is still left to build?A. 218 mWhy? ▾
Explanation: 485 − 267 = 218 m. (228 m is the answer you get if you forget to borrow.)
Q12An engineer wants to put a fence all around this plot. How long will the fence be?B. 40 mWhy? ▾
Explanation: The fence goes around the plot, so we find the perimeter: 12 + 8 + 12 + 8 = 40 m. (96 is the area, not the perimeter.)
Q13This building has 6 floors. Each floor has 8 windows. How many windows are there in all?D. 48Why? ▾
Explanation: 6 floors × 8 windows = 48 windows.
Q14Workers started building a wall in the morning at the time shown on the clock. They worked for 3 hours 30 minutes. At what time did they finish?D. 12:30Why? ▾
Explanation: The clock shows 9:00. 9:00 + 3 hours = 12:00, and 30 more minutes makes 12:30.
Q1596 bricks are shared equally among 8 trolleys. How many bricks go into each trolley?B. 12Why? ▾
Explanation: 96 ÷ 8 = 12, because 8 × 12 = 96.
Q16A safety helmet costs Rs 245 and a pair of safety gloves costs Rs 180. How much do they cost together?A. Rs 425Why? ▾
Explanation: Rs 245 + Rs 180 = Rs 425.
Q17The bulb will glow only when the gap in this circuit is joined. Which material should be used to join the gap?C. Copper wireWhy? ▾
Explanation: Copper is a metal and lets electricity flow through it. Plastic, wood and rubber do not let electricity pass.
Q18Look at the four circuits. In which circuit will the bulb glow?B. Circuit QWhy? ▾
Explanation: Circuit Q has a battery, a bulb and a complete loop of wire. P has a gap, R has no battery and S has no bulb.
Q19Engineers use triangles to make bridges strong. How many triangles can you see in this bridge frame?D. 7Why? ▾
Explanation: There are 4 triangles pointing up and 3 triangles pointing down. 4 + 3 = 7.
Q20After the great Musi flood of 1908, Sir M. Visvesvaraya suggested building reservoirs to protect Hyderabad from floods. Which of these reservoirs was built for this purpose?A. Osman SagarWhy? ▾
Explanation: Osman Sagar (Gandipet), finished in 1920, was built on the Musi to control floods and supply water to Hyderabad. Hussain Sagar is much older, from Qutb Shahi times.
Q21Engineers follow these steps to solve a problem. Which step comes right after 'Plan'?C. CreateWhy? ▾
Explanation: The steps are Ask → Imagine → Plan → Create → Improve. After planning, engineers create (build) their design.
Q22Which type of engineer designs aeroplanes like this one?B. Aerospace engineerWhy? ▾
Explanation: Aerospace engineers design aeroplanes, rockets and satellites.
Q23Which type of engineer creates apps and programs for mobile phones and computers?A. Software engineerWhy? ▾
Explanation: Software engineers write computer programs and build apps.
Q24Engineers build this machine to make electricity from the wind. What is it called?D. Wind turbineWhy? ▾
Explanation: A wind turbine uses moving wind to turn its blades and make electricity. Wind is a clean energy source that does not run out.
Q25An engineer measures a screw with a ruler. How long is the screw?B. 7 cmWhy? ▾
Explanation: The screw starts at 0 and ends at the 7 mark, so it is 7 cm long.

Middle Stage

Grades 6, 7 & 8 · 25 questions · 1 mark each

Quick answer grid

Q1AQ2BQ3CQ4BQ5DQ6BQ7AQ8BQ9CQ10AQ11DQ12CQ13BQ14AQ15DQ16CQ17AQ18BQ19CQ20DQ21BQ22AQ23CQ24DQ25D

Answers with explanations (tap a question to see why)

Q1Engineers' Day honours Sir M. Visvesvaraya. What does the initial 'M' in his name stand for?A. MokshagundamWhy? ▾
Explanation: His full name was Mokshagundam Visvesvaraya. Muddenahalli is the village where he was born, which is a common mix-up.
Q2Sir M. Visvesvaraya was born in Muddenahalli in 1861. In which present-day Indian state is this village?B. KarnatakaWhy? ▾
Explanation: Muddenahalli is in Chikkaballapur district of Karnataka.
Q3From 1912 to 1918, Sir M. Visvesvaraya held the highest administrative post in the Mysore kingdom. What was this post called?C. DiwanWhy? ▾
Explanation: He was the Diwan of Mysore, a post like a chief minister. In this period he helped start new industries, the University of Mysore and the Bank of Mysore.
Q4While Sir M. Visvesvaraya was Diwan, the Government Soap Factory was set up in 1916. Its famous soap is made with which natural oil?B. Sandalwood oilWhy? ▾
Explanation: Mysore Sandal Soap is made with sandalwood oil. The Mysore region was famous for its sandalwood trees.
Q5In 1934, Sir M. Visvesvaraya wrote a book saying India should plan its economic growth. What is the title of this book?D. Planned Economy for IndiaWhy? ▾
Explanation: He wrote 'Planned Economy for India' in 1934. The other books were written by Jawaharlal Nehru, A. P. J. Abdul Kalam and Maulana Azad.
Q6The graph shows a dam's water level during the monsoon. Between which two months did the water level rise the most?B. July–AugustWhy? ▾
Explanation: The rises are: June–July 15 m, July–August 35 m, August–September 10 m. From September to October the level fell by 6 m. The biggest rise is July–August.
Q7A 60 N load is placed 1 m from the fulcrum. How much effort is needed 3 m from the fulcrum on the other side to balance the lever?A. 20 NWhy? ▾
Explanation: Load × load arm = Effort × effort arm. 60 × 1 = Effort × 3, so Effort = 20 N. A longer effort arm reduces the effort needed.
Q8What is the main advantage of using a single fixed pulley?B. It changes the direction of the forceWhy? ▾
Explanation: A single fixed pulley lets you pull down to lift a load up, which is more convenient. The effort needed is about equal to the load.
Q9All three ramps lift the same box to the same height. Ignoring friction, which ramp needs the least effort?C. Ramp RWhy? ▾
Explanation: Ramp R is the longest and has the gentlest slope, so it needs the least effort. The box has to be pushed a longer distance in return.
Q10A steel nail sinks in water, but a huge steel ship floats. Why?A. The ship's hollow shape pushes aside a large amount of waterWhy? ▾
Explanation: A ship's hollow shape pushes aside (displaces) a large volume of water. The upward push (buoyant force) equals the weight of this water and balances the ship's weight (Archimedes' principle).
Q11Why do engineers leave small gaps between sections of a railway track?D. To allow the rails to expand in heatWhy? ▾
Explanation: Metals expand when heated. The gaps give the rails room to expand on hot days so they do not bend. Bridges have similar expansion joints.
Q12Three bulbs are connected in series. If Bulb 2 fuses, what happens to Bulb 1 and Bulb 3?C. They go offWhy? ▾
Explanation: A series circuit has only one path for the current. When one bulb fuses, the path breaks and all the bulbs go off. That is why homes use parallel circuits.
Q13Concrete is made by mixing cement, sand and aggregate in the ratio 1 : 2 : 4. If 35 bags are used in total, how many bags are cement?B. 5Why? ▾
Explanation: Total parts = 1 + 2 + 4 = 7. One part = 35 ÷ 7 = 5 bags. Cement is 1 part, so 5 bags.
Q14On a bridge plan, the scale is 1 cm = 50 m. The bridge is 7.5 cm long on the drawing. What is its real length?A. 375 mWhy? ▾
Explanation: Real length = 7.5 × 50 m = 375 m.
Q15A water pipeline is 2,400 m long and 75% of it has been laid. How many metres are still left to lay?D. 600 mWhy? ▾
Explanation: 25% is left. 25% of 2,400 = 2,400 ÷ 4 = 600 m. (1,800 m is the part that is already laid.)
Q16Two angles of this roof truss triangle are 60° and 40°. What is the third angle?C. 80°Why? ▾
Explanation: The angles of a triangle add up to 180°. 180° − (60° + 40°) = 80°.
Q17A metro train travels 36 km in 45 minutes. What is its average speed in km/h?A. 48 km/hWhy? ▾
Explanation: 45 minutes = 3/4 hour. Speed = 36 ÷ 3/4 = 36 × 4/3 = 48 km/h.
Q18This tank is 5 m long, 4 m wide and 2 m deep. How many litres of water can it hold? (1 m³ = 1,000 L)B. 40,000 LWhy? ▾
Explanation: Volume = 5 × 4 × 2 = 40 m³. 40 × 1,000 = 40,000 litres.
Q19The pie chart shows where a state gets its electricity. What percentage comes from renewable sources (solar, wind and hydro)?C. 50%Why? ▾
Explanation: 20% + 15% + 15% = 50%. Coal is not renewable. (35% is the answer if hydro is left out.)
Q20Which branch of engineering deals with designing flyovers, bridges, dams and roads?D. Civil engineeringWhy? ▾
Explanation: Civil engineers design and build public structures such as flyovers, bridges, dams and roads. Sir M. Visvesvaraya was a civil engineer.
Q21In August 2023, India's Chandrayaan-3 lander made a soft landing on the Moon. Near which region of the Moon did it land?B. South pole regionWhy? ▾
Explanation: On 23 August 2023, India became the first country to land near the Moon's south pole. 23 August is now celebrated as National Space Day.
Q22The world's highest railway arch bridge was opened in Jammu and Kashmir in 2025. Over which river is it built?A. ChenabWhy? ▾
Explanation: The Chenab Rail Bridge stands about 359 m above the Chenab river, which is higher than the Eiffel Tower. It is part of the Udhampur–Srinagar–Baramulla rail link.
Q23Gear A turns clockwise. In which direction will Gear C turn?C. ClockwiseWhy? ▾
Explanation: Meshing gears turn in opposite directions. A turns clockwise, so B turns anticlockwise, and C turns clockwise again.
Q24Gear A has 40 teeth and drives Gear B, which has 10 teeth. When Gear A makes one full turn, how many turns does Gear B make?D. 4Why? ▾
Explanation: In one turn, A moves 40 teeth past B. Each turn of B uses 10 teeth, so B turns 40 ÷ 10 = 4 times. The smaller gear turns faster.
Q25Just before opening day, an engineer notices a crack in one pillar of a new bridge. What is the most responsible thing to do?D. Report it and delay opening until it is checked and repairedWhy? ▾
Explanation: Public safety comes first. An engineer must report the problem and make sure it is fixed before anyone uses the bridge, even if the opening is delayed.

Secondary Stage

Grades 9 & 10 · 25 questions · 1 mark each

Quick answer grid

Q1BQ2DQ3AQ4CQ5BQ6AQ7CQ8DQ9AQ10BQ11CQ12AQ13DQ14BQ15AQ16CQ17BQ18DQ19AQ20CQ21BQ22DQ23CQ24DQ25B

Answers with explanations (tap a question to see why)

Q1Sir M. Visvesvaraya helped set up a steel plant at Bhadravati, Karnataka, in 1923. It was later renamed in his honour. What is it called today?B. Visvesvaraya Iron and Steel PlantWhy? ▾
Explanation: The Mysore Iron Works at Bhadravati is now the Visvesvaraya Iron and Steel Plant (VISL), a unit of the Steel Authority of India.
Q2A technological university in Belagavi, to which most engineering colleges in Karnataka are affiliated, is named after Sir M. Visvesvaraya. What is its name?D. Visvesvaraya Technological UniversityWhy? ▾
Explanation: Visvesvaraya Technological University (VTU), Belagavi, was set up in 1998 and is named after him.
Q3In 1899, Sir M. Visvesvaraya introduced a system in the Deccan canals where the irrigated area was divided into sections that received water in turns. What was this system called?A. Block system of irrigationWhy? ▾
Explanation: Under the Block system, the area was divided into blocks that received canal water in rotation. This shared limited water fairly and made better use of it.
Q4Case study: After the 1908 Musi flood, Sir M. Visvesvaraya advised building reservoirs upstream of Hyderabad. The graph shows the river flow in the city after heavy rain, with and without an upstream reservoir. What is the main reason the reservoir reduces flood risk?C. It stores the flood peak and releases the water slowlyWhy? ▾
Explanation: The reservoir holds back the sudden rush of flood water and lets it out gradually. The graph shows a much lower, flatter peak that stays below the danger level. Osman Sagar and Himayat Sagar were built for this purpose.
Q5In a hydroelectric power station, which sequence of energy changes takes place?B. Potential → Kinetic → ElectricalWhy? ▾
Explanation: Water stored high in the dam has potential energy. As it flows down, this becomes kinetic energy, which turns the turbine. The generator then changes it into electrical energy.
Q6Every second, 1000 kg of water falls through a height of 50 m. How much power is available from the falling water? (g = 10 m/s²)A. 500 kWWhy? ▾
Explanation: Power = mgh / t = (1000 × 10 × 50) / 1 = 500,000 W = 500 kW.
Q7A 4 Ω and a 6 Ω resistor are connected in series to a 20 V battery. What current does the ammeter show?C. 2 AWhy? ▾
Explanation: In series, total resistance = 4 + 6 = 10 Ω. By Ohm's law, I = V / R = 20 / 10 = 2 A.
Q8Two 6 Ω resistors are connected in parallel between X and Y. What is the equivalent resistance?D. 3 ΩWhy? ▾
Explanation: 1/R = 1/6 + 1/6 = 2/6 = 1/3, so R = 3 Ω. (12 Ω would be the answer for series, and 1/3 is the value of 1/R, not R.)
Q9A 1000 W water pump runs for 2 hours every day. How many units (kWh) of electricity does it use in 30 days?A. 60 unitsWhy? ▾
Explanation: Energy = 1 kW × 2 h × 30 days = 60 kWh = 60 units.
Q10In a house wiring system, when does a miniature circuit breaker (MCB) trip?B. When the current goes above the safe limit, for example in an overload or short circuitWhy? ▾
Explanation: An MCB switches off the circuit automatically when too much current flows. This protects the wiring and appliances from overheating and fire.
Q11A periscope uses two plane mirrors to let a person see objects above eye level. At what angle is each mirror placed to the tube?C. 45°Why? ▾
Explanation: Each mirror is at 45°. This turns the light through 90° at each mirror, so light entering at the top comes out at the bottom towards the eye.
Q12A vehicle headlight uses a concave reflector to give a strong parallel beam. Where must the bulb be placed?A. At the principal focusWhy? ▾
Explanation: Light rays from a source at the focus of a concave mirror become parallel to the principal axis after reflection. This gives a strong, straight beam.
Q13Why is a convex mirror used as a rear-view mirror in vehicles?D. It gives an erect, diminished image and a wider field of viewWhy? ▾
Explanation: A convex mirror always forms an erect, diminished image. This lets the driver see a much wider area of traffic behind the vehicle.
Q14An engineer stands 50 m from the foot of a mobile tower. The angle of elevation of the top of the tower is 60°. What is the height of the tower?B. 50√3 mWhy? ▾
Explanation: tan 60° = h / 50, so h = 50 × √3 = 50√3 m (about 86.6 m).
Q15A cylindrical water tank has a radius of 7 m and a height of 10 m. What is its volume? (Ï€ = 22/7)A. 1,540 m³Why? ▾
Explanation: V = Ï€r²h = 22/7 × 7 × 7 × 10 = 1,540 m³. (440 m² is the curved surface area, not the volume.)
Q16Five concrete cubes were tested for strength. The graph shows the results. What is the mean strength?C. 30 MPaWhy? ▾
Explanation: Mean = (28 + 30 + 32 + 29 + 31) / 5 = 150 / 5 = 30 MPa.
Q17On a site plan, two towers are at A(2, 3) and B(8, 11). What is the distance AB?B. 10 unitsWhy? ▾
Explanation: AB = √[(8 − 2)² + (11 − 3)²] = √(36 + 64) = √100 = 10 units. (14 is 6 + 8, which is wrong.)
Q18A wall has 30 bricks in the bottom row, 28 in the next, 26 in the next, and so on. How many bricks are there in the 10th row?D. 12Why? ▾
Explanation: This is an AP with a = 30 and d = −2. a₁₀ = a + 9d = 30 + 9 × (−2) = 30 − 18 = 12.
Q19A rectangular plot has an area of 300 m². Its length is 5 m more than its width. What is the width?A. 15 mWhy? ▾
Explanation: x(x + 5) = 300 gives x² + 5x − 300 = 0, which factorises to (x + 20)(x − 15) = 0. Width cannot be negative, so x = 15 m. (20 m is the length.)
Q20Steel towers that carry electricity lines are coated with a thin layer of another metal to prevent rusting. Which metal is used?C. ZincWhy? ▾
Explanation: Coating iron or steel with zinc is called galvanisation. The zinc layer protects the steel from rusting even if the coating gets scratched.
Q21Stainless steel is used in modern bridges because it does not rust easily. Iron is mixed with which two metals to make it?B. Chromium and nickelWhy? ▾
Explanation: Stainless steel is an alloy of iron with chromium and nickel. Copper and zinc make brass, and lead and tin make solder.
Q22What energy change takes place in an electric motor?D. Electrical energy to mechanical energyWhy? ▾
Explanation: A current-carrying coil in a magnetic field experiences a force and rotates, so an electric motor changes electrical energy into mechanical energy. A generator does the reverse.
Q23A solar panel gives an output of 250 W for 6 hours of sunlight. How much electrical energy does it produce?C. 1.5 kWhWhy? ▾
Explanation: Energy = 250 W × 6 h = 1,500 Wh = 1.5 kWh.
Q24India's first vertical-lift railway sea bridge, opened in 2025, has a middle span that rises to let ships pass. It connects the mainland to which island?D. Rameswaram (Pamban Island)Why? ▾
Explanation: The new Pamban Bridge links the mainland to Rameswaram on Pamban Island in Tamil Nadu. It replaced the old Pamban Bridge built in 1914.
Q25A bridge has a maximum load limit of 20 tonnes. An empty truck weighs 12 tonnes and is carrying a 10-tonne load. Should the truck be allowed to cross?B. No, because the total weight of 22 t is more than the 20 t limitWhy? ▾
Explanation: The total weight is 12 + 10 = 22 t, which is more than the 20 t limit. Engineers set load limits to keep bridges safe, and driving faster does not reduce the load.

AIMS Olympiad Academy
Engineers' Day 2026 · NEP 2020 stage-wise quizzes

Post a Comment

0Comments

Post a Comment (0)