All Free Everyday Science MCQs with Answers

1851. Which is known as 'Lifeblood of industries'?

• A. Finance
• B. Transport
• C. logistic
• D. Supplies

Explanation: Finance is often called the lifeblood of industry because production, expansion, wages, and trade all require a continuous flow of capital. Transport is instead commonly described as the lifeline of trade or commerce.

1852. Quality rating of deisel is called?

• A. Octane
• B. Cetane
• C. Protane
• D. Butane

Explanation: Cetane number measures the ignition quality of diesel fuel, with a higher number generally indicating easier and smoother ignition. Octane number is used for petrol or gasoline.

1853. Which of the following is used to control rods in nuclear fission?

• A. Graphite
• B. Heavy Water
• C. Cadmium
• D. All of these

Explanation: Cadmium absorbs neutrons and is therefore used in control rods to regulate the chain reaction. Graphite and heavy water act mainly as moderators, slowing neutrons rather than controlling the rods.

1854. Heat exchanger tubes are never made of:

• A. Plain Carbon Steel
• B. Stainless Steel
• C. Lead
• D. Copper

Explanation: Heat-exchanger tubes require adequate strength and heat-transfer performance, so materials such as carbon steel, stainless steel, and copper are commonly used. Lead is too soft and mechanically weak for ordinary heat-exchanger tubing.

1855. Washing machine is working on the principle of?

• A. Photoelectric effect
• B. Electric-magnetic induction
• C. Centrifugation
• D. None of these

Explanation: A washing machine spins clothes rapidly so centrifugal action pushes water outward through the fabric and drum holes. This spin-drying process is called centrifugation.

1856. The unit of home electricity energy consumption is ?

• A. Watt hour
• B. Joule hour
• C. Killowatt hour
• D. Kilo joule hour

Explanation: Domestic electricity consumption is measured in kilowatt-hours, the energy used by a 1-kilowatt appliance operating for one hour. A watt-hour is also an energy unit but is much smaller and is not the usual household billing unit.

1857. Steam Turbine was introduce by ________ ?

• A. C.A. Parson
• B. Orwill Right
• C. Arkwright
• D. Alexander son

Explanation: Sir Charles Parsons developed the practical steam turbine in 1884, greatly improving the conversion of steam energy into rotary motion. The other names are associated with different inventions or fields.

1858. BRT stand for ?

• A. Blue rapid Transport
• B. Best road transportation
• C. Bus Rapid Transit
• D. Best road Transit

Explanation: BRT stands for Bus Rapid Transit, a public-transport system using buses on dedicated or priority routes to provide faster service.

1859. Golden rice has the highest quantity of______?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin K

Explanation: Golden rice is genetically modified to produce beta-carotene in its grains. The body converts beta-carotene into vitamin A, helping prevent deficiency.

1860. Which of the following is not a donor atom?

• A. Phosphorus
• B. Antimony
• C. Arsenic
• D. Aluminum

Explanation: Phosphorus, arsenic and antimony are group 15 elements that supply extra electrons when added to silicon, so they act as donor impurities. Aluminium is a group 13 acceptor impurity instead.