Which vitamin is also known as ascorbic acid?
A) Vitamin A
B) Vitamin B12
C) Vitamin C ✅
D) Vitamin D Explanation: Vitamin C is commonly known as ascorbic acid and is essential for immune function and collagen synthesis.
Which vitamin is primarily responsible for vision?
A) Vitamin A ✅
B) Vitamin D
C) Vitamin B6
D) Vitamin E Explanation: Vitamin A is essential for the maintenance of vision and eye health.
Which vitamin helps in blood clotting?
A) Vitamin C
B) Vitamin D
C) Vitamin K ✅
D) Vitamin B1 Explanation: Vitamin K is crucial for the synthesis of clotting factors.
Which vitamin is synthesized by sunlight exposure?
A) Vitamin A
B) Vitamin D ✅
C) Vitamin K
D) Vitamin C Explanation: Vitamin D is produced in the skin upon exposure to UVB rays from sunlight.
Which vitamin deficiency causes scurvy?
A) Vitamin B1
B) Vitamin C ✅
C) Vitamin A
D) Vitamin D Explanation: Scurvy results from a deficiency of vitamin C, affecting collagen production.
Which is a fat-soluble vitamin?
A) Vitamin C
B) Vitamin B12
C) Vitamin D ✅
D) Vitamin B2 Explanation: Fat-soluble vitamins include A, D, E, and K.
Vitamin B12 is mainly found in:
A) Fruits
B) Vegetables
C) Animal products ✅
D) Nuts Explanation: Vitamin B12 is predominantly found in meat, eggs, and dairy.
Beriberi is caused by deficiency of:
A) Vitamin B6
B) Vitamin B1 ✅
C) Vitamin B2
D) Vitamin C Explanation: Thiamine (B1) deficiency leads to beriberi.
Which vitamin acts as an antioxidant?
A) Vitamin K
B) Vitamin E ✅
C) Vitamin D
D) Vitamin B1 Explanation: Vitamin E protects cells from oxidative damage.
Which vitamin is essential for calcium absorption?
A) Vitamin A
B) Vitamin C
C) Vitamin D ✅
D) Vitamin K Explanation: Vitamin D enhances intestinal absorption of calcium.
Pellagra is caused by deficiency of:
A) Vitamin B3 ✅
B) Vitamin B6
C) Vitamin B12
D) Vitamin A Explanation: Pellagra results from a deficiency of niacin (B3).
Which vitamin is important for red blood cell formation?
A) Vitamin D
B) Vitamin B12 ✅
C) Vitamin K
D) Vitamin E Explanation: B12 is necessary for RBC formation in the bone marrow.
Vitamin A deficiency causes:
A) Night blindness ✅
B) Rickets
C) Scurvy
D) Pellagra Explanation: Lack of vitamin A leads to impaired night vision.
Which vitamin helps prevent neural tube defects during pregnancy?
A) Vitamin C
B) Folic acid ✅
C) Vitamin D
D) Vitamin K Explanation: Folic acid (B9) is essential in early pregnancy for fetal neural development.
Which vitamin helps in energy metabolism?
A) Vitamin A
B) Vitamin D
C) Vitamin B-complex ✅
D) Vitamin K Explanation: B vitamins play a key role in converting food into energy.
Which of the following is a water-soluble vitamin?
A) Vitamin A
B) Vitamin C ✅
C) Vitamin D
D) Vitamin E Explanation: Vitamin C and all B-complex vitamins are water-soluble.
What does vitamin D prevent?
A) Scurvy
B) Rickets ✅
C) Pellagra
D) Night blindness Explanation: Vitamin D is vital for bone health and prevents rickets.
Vitamin E is also known as:
A) Retinol
B) Ascorbic acid
C) Tocopherol ✅
D) Niacin Explanation: Tocopherol is another name for vitamin E.
Vitamin B9 is also called:
A) Niacin
B) Thiamine
C) Folic acid ✅
D) Riboflavin Explanation: Vitamin B9 is essential in DNA synthesis and cell growth.
Which vitamin is essential for the immune system?
A) Vitamin K
B) Vitamin C ✅
C) Vitamin B1
D) Vitamin D Explanation: Vitamin C boosts immunity and helps fight infections.
🟡 Moderate Level (21–40)
Vitamin D deficiency in adults causes:
A) Rickets
B) Osteomalacia ✅
C) Scurvy
D) Pellagra Explanation: Osteomalacia is softening of bones due to low vitamin D.
Vitamin B2 is also called:
A) Riboflavin ✅
B) Niacin
C) Pyridoxine
D) Biotin Explanation: Riboflavin (B2) is vital for energy metabolism.
Which vitamin deficiency causes bleeding gums?
A) Vitamin D
B) Vitamin K
C) Vitamin C ✅
D) Vitamin B1 Explanation: Scurvy from vitamin C deficiency results in gum bleeding.
Vitamin B6 is also known as:
A) Niacin
B) Biotin
C) Pyridoxine ✅
D) Riboflavin Explanation: Pyridoxine helps in amino acid metabolism.
Which vitamin is destroyed by heat easily?
A) Vitamin C ✅
B) Vitamin K
C) Vitamin D
D) Vitamin B12 Explanation: Vitamin C is heat-sensitive and easily destroyed during cooking.
Which vitamin is important for DNA synthesis?
A) Vitamin B9 ✅
B) Vitamin B2
C) Vitamin E
D) Vitamin A Explanation: Folic acid plays a major role in DNA synthesis and repair.
Excess of which vitamin causes hypervitaminosis?
A) Vitamin B12
B) Vitamin C
C) Vitamin A ✅
D) Vitamin B1 Explanation: Fat-soluble vitamins like A can accumulate and become toxic.
Which vitamin is also used to treat acne?
A) Vitamin C
B) Vitamin A ✅
C) Vitamin E
D) Vitamin D Explanation: Retinoids (vitamin A derivatives) are used for acne treatment.
Which B vitamin is involved in nerve function?
A) Vitamin B1 ✅
B) Vitamin B2
C) Vitamin B5
D) Vitamin B7 Explanation: Thiamine supports nerve health and function.
Which vitamin is needed to form collagen?
A) Vitamin K
B) Vitamin A
C) Vitamin C ✅
D) Vitamin D Explanation: Vitamin C is crucial for collagen production.
Which vitamin deficiency causes megaloblastic anemia?
A) Vitamin A
B) Vitamin B12 ✅
C) Vitamin D
D) Vitamin E Explanation: B12 and folate deficiencies lead to abnormal RBCs.
Which vitamin is a coenzyme in carboxylation reactions?
A) Vitamin K ✅
B) Vitamin A
C) Vitamin C
D) Vitamin B6 Explanation: Vitamin K is needed for carboxylation of clotting factors.
Which vitamin is necessary for the synthesis of neurotransmitters?
A) Vitamin B6 ✅
B) Vitamin C
C) Vitamin A
D) Vitamin D Explanation: Pyridoxine helps in neurotransmitter synthesis.
Which vitamin prevents oxidative stress?
A) Vitamin E ✅
B) Vitamin A
C) Vitamin D
D) Vitamin K Explanation: Vitamin E acts as a major antioxidant.
Which vitamin is essential for hair and nail health?
A) Vitamin D
B) Biotin ✅
C) Niacin
D) Riboflavin Explanation: Biotin (B7) promotes hair and nail growth.
Vitamin A is stored in the:
A) Kidney
B) Liver ✅
C) Brain
D) Lungs Explanation: The liver stores vitamin A in the form of retinyl esters.
Which vitamin is found in yellow and orange vegetables?
A) Vitamin K
B) Vitamin A (beta-carotene) ✅
C) Vitamin B12
D) Vitamin E Explanation: Beta-carotene, a precursor of vitamin A, is abundant in colored veggies.
Which vitamin is also known as anti-sterility vitamin?
A) Vitamin A
B) Vitamin E ✅
C) Vitamin D
D) Vitamin K Explanation: Vitamin E maintains reproductive health in animals.
Which vitamin deficiency can lead to depression?
A) Vitamin B12 ✅
B) Vitamin K
C) Vitamin D
D) Vitamin A Explanation: B12 is linked with neurological and psychological functions.
Which vitamin is added to milk to prevent rickets?
A) Vitamin C
B) Vitamin D ✅
C) Vitamin K
D) Vitamin B2 Explanation: Fortified milk contains vitamin D to prevent bone diseases.
🔴 Hard Level (41–50)
Which vitamin is essential for carnitine synthesis?
A) Vitamin B12
B) Vitamin C ✅
C) Vitamin D
D) Vitamin E Explanation: Vitamin C aids in carnitine synthesis, crucial for energy metabolism.
The deficiency of which vitamin is rare but can cause hemorrhagic disease in newborns?
A) Vitamin D
B) Vitamin C
C) Vitamin K ✅
D) Vitamin A Explanation: Newborns may lack vitamin K, affecting clotting.
Which vitamin is most likely to cause toxicity symptoms if taken in excess?
A) Vitamin C
B) Vitamin D ✅
C) Vitamin B1
D) Folic acid Explanation: Vitamin D toxicity can lead to hypercalcemia.
Biotin is a coenzyme for:
A) Dehydrogenases
B) Carboxylases ✅
C) Decarboxylases
D) Kinases Explanation: Biotin functions as a coenzyme for carboxylation reactions.
What is the active form of vitamin D?
A) Cholecalciferol
B) Ergocalciferol
C) Calcitriol ✅
D) Retinol Explanation: Calcitriol is the hormonally active form of vitamin D.
Which vitamin helps convert homocysteine to methionine?
A) Vitamin B6
B) Vitamin B12 ✅
C) Vitamin B1
D) Vitamin C Explanation: B12 is required in the remethylation of homocysteine.
Which vitamin helps in vision in low light?
A) Vitamin D
B) Vitamin A ✅
C) Vitamin E
D) Vitamin K Explanation: Vitamin A is needed for rhodopsin, a pigment in low-light vision.
Which vitamin regulates gene expression?
A) Vitamin B6
B) Vitamin D ✅
C) Vitamin E
D) Vitamin C Explanation: Vitamin D binds to receptors influencing gene transcription.
The coenzyme form of vitamin B1 is:
A) TPP (Thiamine pyrophosphate) ✅
B) FAD
C) NAD
D) FMN Explanation: TPP is the active coenzyme form of thiamine.
Which vitamin requires intrinsic factor for absorption?
A) Vitamin C
B) Vitamin B6
C) Vitamin B12 ✅
D) Vitamin K Explanation: Vitamin B12 binds intrinsic factor for intestinal absorption.