All Free Everyday Science MCQs with Answers

1071. Chromosomes are made up of __________ ?

• A. DNA only
• B. DNA and RNA
• C. Proteins only
• D. DNA and Proteins

Explanation: Chromosomes consist of DNA wound around structural proteins called histones. DNA carries genetic information, while the proteins help package and organize it.

1072. Cataract is a disease of ________?

• A. Eyes
• B. Throat
• C. Lungs
• D. Circulatory system

Explanation: A cataract is the clouding of the eye’s normally clear lens, which causes blurred or hazy vision. It is therefore an eye disorder, not a disease of the throat, lungs, or circulatory system.

1073. Which bird weighs less than a penny?

• A. Goldcrest
• B. Weebill
• C. Hummingbird
• D. None of these

Explanation: The smallest hummingbirds, especially the bee hummingbird, weigh roughly 1.6 to 2 grams, less than a modern US penny weighing 2.5 grams. Goldcrests and weebills are generally heavier.

1074. __________ Protect us from diseases?

• A. Vitamins
• B. minerals
• C. Carbohydrates
• D. None of these

Explanation: Vitamins support immune function and other protective body processes, so deficiencies can increase susceptibility to disease. Minerals are also essential, but this standard MCQ conventionally identifies vitamins as the protective nutrients.

1075. The major source of quick energy is ___________?

• A. Carbohydrates
• B. Minerals
• C. vitamins
• D. None of these

Explanation: Carbohydrates are quickly digested into glucose, the body's readily available fuel for immediate energy. Fats provide more stored energy, but they are used more slowly.

1076. All the bones of the body make a frame called?

• A. Skelton
• B. Tissue
• C. Skull
• D. None of these

Explanation: The complete framework formed by all the bones is called the skeleton. The skull is only the bony structure protecting the brain, while tissue is a general body material.

1077. Skin is _____ thick?

• A. 2mm
• B. 2cm
• C. 3mm
• D. 3cm

Explanation: Skin thickness varies by body region, but its commonly quoted average thickness is about 2 mm. It is much thinner than 2 cm, which is a frequent unit trap.

1078. How many bones are in Human Skull?

• A. 22
• B. 25
• C. 26
• D. None of these

Explanation: An adult human skull is conventionally counted as 22 bones: 8 cranial bones and 14 facial bones. Small ear bones are usually counted separately in general anatomy questions.

1079. How many bones in each hand?

• A. 26
• B. 27
• C. 28
• D. 30

Explanation: Each hand has 27 bones: 8 wrist bones, 5 palm bones and 14 finger bones. The 26-bone count belongs to each foot, not each hand.

1080. how many bones in each foot ?

• A. 26
• B. 27
• C. 28
• D. 30Physics

Explanation: Each human foot contains 26 bones, including 7 tarsals, 5 metatarsals and 14 toe bones. The extra word “Physics” is unrelated to the question.