All Free Everyday Science MCQs with Answers

1021. Which of the following animal has blue blood?

• A. Snail
• B. Octopus
• C. Spider
• D. All of above

Explanation: Snails, octopuses and spiders can have bluish blood because their oxygen-carrying pigment is copper-based haemocyanin rather than iron-based haemoglobin. Therefore all three listed animals fit.

1022. _______ is called folic acid.

• A. Vitamin B1
• B. Vitamin B6
• C. Vitamin B9
• D. Vitamin B12

Explanation: Folic acid is the water-soluble B vitamin known as vitamin B9, needed especially for DNA synthesis and red-blood-cell formation. B12 is another important blood-related vitamin but is not folic acid.

1023. What is the name of the chart with letters in multiple rows, used for an eye test ?

• A. Snellen Chart
• B. Maslow's pyramid
• C. Gantt Chart
• D. Peptide Test

Explanation: The Snellen chart tests visual acuity using rows of letters that gradually decrease in size. The other charts are used for planning, hierarchy or unrelated purposes.

1024. Which of the following is a rich source of Vitamin B-12?

• A. Cashew nut
• B. Milk
• C. Apple
• D. Watermelon

Explanation: Milk is a useful dietary source of vitamin B12, which is naturally concentrated mainly in animal-derived foods. Fruits and cashew nuts do not normally provide a significant natural amount of B12.

1025. The energy currency of the cell is called?

• A. ATP
• B. Fat
• C. LEAD
• D. None of These

Explanation: ATP, or adenosine triphosphate, stores and transfers usable energy for cellular processes such as active transport and muscle contraction. Fat is an energy reserve, but it is not the cell's immediate energy currency.

1026. Who is the inventor of the first magnetic resonance imaging (MRI) machine?

• A. Godfrey Hounsfieldv
• B. Mattias Schleiden
• C. Raymond Damadian
• D. Theodore Schwann

Explanation: Raymond Damadian built the first full-body MRI scanner and is widely credited with inventing the MRI machine. Hounsfield is associated with the invention of computed tomography, not MRI.

1027. Cancer that does not form a tumor.

• A. metastatic breast cancer
• B. leukemia
• C. lung cancer
• D. bladder cancer

Explanation: Leukemia is a cancer of blood-forming tissues in which abnormal cells circulate through the blood and bone marrow rather than forming one solid tumor. Breast, lung, and bladder cancers usually begin as tumors in organs.

1028. How Many Megapixels is the Human Eye?

• A. 570
• B. 576
• C. 560
• D. None of These

Explanation: The human eye is often compared with a camera of about 576 megapixels, based on an estimate of retinal resolution. This is only an approximate analogy because the eye and a digital camera process images differently.

1029. Tetanus is a _________ infection.

• A. Viral
• B. Bacterial
• C. Fungal
• D. Parasitic

Explanation: Tetanus is caused by the bacterium Clostridium tetani, whose spores can enter wounds and produce a neurotoxin. It is therefore bacterial rather than viral, fungal, or parasitic.

1030. Parkinson is a disease of____________?

• A. Eyes
• B. Brain
• C. Heart
• D. Lungs

Explanation: Parkinson’s disease is a progressive disorder of the brain, especially involving loss of dopamine-producing nerve cells in the substantia nigra. Its characteristic effects include tremor, stiffness, and slowed movement.