The Dr. Homi Bhabha Balvaidnyanik Competition (DHBBVC) is one of Maharashtra’s most prestigious science competitions for school students. It is organized by the Mumbai Science Teachers’ Association.
(MSTA) to encourage scientific thinking, curiosity, experimentation, and problem-solving skills. The competition has been conducted since 1981.
Question Paper 2025
1. Select the correct option to solve the analogy.
Natural rubber : Latex :: Artificial rubber : _____
A. Crude oil
B. Sulphur
C. Vegetable oil
D. Castor oil
View Answer
A
2. Who am I?
P- I protect your eyes through green leaves.
Q- I am present in orange. My absence will delay the wound healing process.
S- I am present in milk. I am essential for the formation of Red Blood Cells.
P Q S
(Vitamin) (Vitamin) (Vitamin)
A. A C B12
B. C A D
C. B9 D A
D. A E B9
View Answer
A
3. Observe the pictures and select the odd one out for the force applied in each case.
View Answer
D
4. Cutting paper with pair of scissors is an example of _______.
A. Lever
B. Wedge
C. Lever and Wedge
D. Wedge and inclined plane
View Answer
C
5. Which of the following protect us from harmful Sun rays?
A. Hair on skin
B. Blood vessels in skin
C. Sweat glands in skin
D. Melanin in skin
View Answer
D
6. Amar travels from Mumbai to Pune and covers the distance of 180 Kms in 4 hrs. Akabar travels from Mumbai to Alibaug and covers the distance of 160 Kms in 4 hrs. While Anthony travels from Mumbai to Goa and covers the distance of 600 kms in 10 hrs. Select the correct option for the speed of Amar, Akbar and Anthony.
A. Amar > Akbar > Anthony
B. Amar < Akbar < Anthony
C. Anthony > Amar > Akbar
D. Anthony > Akbar > Amar
View Answer
C
7. Identify the CORRECT statement about minerals.
A. Sodium in salt is used to carry oxygen through blood.
B. Zinc in meat used to control energy utilisation by the body.
C. Calcium from milk is required for muscle efficiency.
D. Iron from spinach helps in maintaining water balance of the body.
View Answer
C
8. Select the odd one out.
A. Swine flu
B. Tuberculosis
C. Polio
D. Measles
View Answer
B
9. While drinking juice using a straw, what is the relation between air pressure ‘ S’ in the straw and air pressure ‘P’ in the bottle.
A. S = P
B. S < P
C. S > P
D. S ≥ P
View Answer
B
10. Identify the type of thread from its specific characteristics.
1.Static electricity develops in this thread
2.The thread is not made of
3.The thread does not absorb water
A. Jute
B. Wool
C. Terene
D. Silk
View Answer
C
11. Select the INCORRECT statement about X – Ray image.
A. X – Ray is a painless and fast investigative test
B. X – Ray gives images of bones and muscles in the body
C. X – Ray image of muscles is grey in colour
D. X – Ray image of bone is black in colour
View Answer
D
12. Farmer adds a certain microbes to his compost pit. After a month he observes that the compost is warmer than before. Which property of the microbes explains this?
A. Photosynthesis
B. Methane production
C. Aerobic decomposition
D. Anaerobic decomposition
View Answer
C
13. A glass tumbler breaks when hot water is suddenly poured into it. Why?
A. Glass expands uniformly
B. Inner surface of the glass expands rapidly
C. Glass is good conductor of heat
D. Glass is semiconductor of heat
View Answer
B
14. 1, 2 and 3 are three types of mirrors. When alphabet B is placed in front of each mirror, following images are formed. Select the CORRECT option for these images.
1 2 3
A. Plane Concave Convex
B. Concave Convex Plane
C. Convex Plane Concave
D. Plane Convex Concave
View Answer
A
15. During winter season, when we open folded polyester or woolen clothes, a crackling sound is heard with a spark because _____.
A. of generation of static electricity due to friction
B. the clothes are kept unused for several days
C. the clothes are kept in dark for several days
D. friction develops magnetism
View Answer
A
16. When a person sharpens a knife, which property of friction is used?
A. Friction makes the surface smooth
B. Friction works in direction opposite to motion
C. Friction erodes the contact surface
D. Friction emits heat energy
View Answer
C
17. Identify the INCORRECT statement:
A. Carbohydrates are formed during photosynthesis
B. Vitamin E helps in blood clotting
C. Buttermilk contains probiotic microbes
D. Minerals help in keeping the body healthy
View Answer
B
18. Boiling point of water from Dead Sea _____ boiling of water from Arabian Sea.
A. >
B. <
C. =
D. ≥
View Answer
A
19. Observe the arrows and select the appropriate food chain.
A. Myna → Earthworm → Decaying leaves
B. Koel → Caterpillar → Green leaves
C. Snake ← Rat ← Wheat
D. Frog ← Stork ← Mosquito
View Answer
C
20. Observe the picture and select the CORRECT calamity for which DROP, COVER and HOLD can be used as preventive measure.
A. Earthquake
B. Flood
C. Forest fire
D. Storm
View Answer
A
21. Select the Incorrect option for the factors responsible for soil formation from rocks.
P – Sun, Q – Wind, R – Rain, S – Trees, T – Rodent
A. P, Q, R
B. P, R, S
C. Q, S, T
D. All of the above
View Answer
D
22. A sportsman needs quick muscle recovery after tough match. Which minerals in banana help in this?
A. Sodium
B. Potassium
C. Iodine
D. Calcium
View Answer
B
23. A child can who frequently bleeds from nose and gums might be lacking which vitamin?
A. Vitamin A
B. Vitamin K
C. Vitamin D
D. Vitamin C
View Answer
D
24. Identify the analogy:
Troposphere: _____ :: Exosphere: Artificial satellite
A. Space ship
B. International space station
C. Air transport
D. Natural satellite
View Answer
C
25. A gazing food chain always begins with ______.
A. Sunlight
B. Plants
C. Animals
D. Microbe
View Answer
B
26. Identify the CORRECT pair:
A. Fructose: Honey and cereals
B. Sucrose: Oats and pulses
C. Maltose: Sugarcane and beetroot
D. Lactose: Milk and paneer
View Answer
D
27. An object is Oscillating with a frequency of 25 Hz, this means
A. It takes 25 seconds for one vibration
B. It is moving up and down 25 times per second
C. It is moving forward 25 cm per second
D. It complete 25 circles per second
View Answer
B
28. Identify the blood vessels P and Q if
P – carries the blood away from the heart.
Q – brings blood back to the heart
P Q
(blood vessel) (blood vessel)
A. Artery Capillary
B. Vein Capillary
C. Artery Vein
D. Vein Artery
View Answer
C
29. Which of the following helps in maintaining balance of the environment?
A. Water cycle
B. Gaseous cycle
C. Food chain
D. All of these
View Answer
D
30. Select the INCORRECT statement about sacred groves.
A. Sacred groves protect local biodiversity.
B. Sacred groves are connected with traditions of local people.
C. Sacred groves are responsible for reduction in ground water.
D. Sacred groves help maintain ecological balance.
View Answer
C
31. Metals expand on heating and contract on cooling. In which of the following activities this principle is used?
A. Making metal sheets
B. Processing metals to prevent rusting
C. Fitting metallic rim on a wooden bullock cart wheel
D. Gold and Silver plating process
View Answer
C
32. A robin bird can find an earthworm from deep layers of soil easily because _______.
(P) robin has Sharp sense of hearing
(Q) robin can hear the sharp sound made by the earthworm
(R) robin can hear the vibrations made by the movements of earthworm
(S) robin has sharp sense of vision
A. P and Q
B. Q and S
C. P and S
D. P and R
View Answer
D
33. Ajay can see the mango tree clearly from his window. Which of the following statements explain this process perfectly?
A. Light falls on the mango tree
B. Light enters Ajays eyes
C. Light enters Ajays eyes through mango tree
D. Light goes to mango tree from Ajays eyes
View Answer
C
34. Select the odd one.
Identify the animal that does not undergo metamorphosis .
A. Frog
B. Snake
C. Butterfly
D. Mosquito
View Answer
B
35. Period of rotation and revolution of moon is same. Hence ______.
A. there are no seasons on moon
B. there is no water on moon
C. temperature of the moon is always stable
D. only one side of the moon is visible from earth
View Answer
D
36. Match the following
Group A Group B
1.Salt a) freshwater lake
2.Sugarcane b) seawater
3.Catechu c) farm
4.Water chestnut d) forest
A. 1- c; 2 – b; 3- d; 4 – a;
B. 1- d; 2 – c; 3- b; 4 – a;
C. 1- b; 2 – c; 3- d; 4 – a;
D. 1- a; 2 – c; 3- d; 4 – b;
View Answer
C
37. What will happen if a convex mirror is used in a solar cooker?
A. Food will get burnt
B. Cooking process will be fast
C. Food will not be cooked properly
D. Solar cooker will stop working
View Answer
C
38. Select the CORRECT option for use of stethoscope.
(P) To hear bowel movements
(Q) To hear sound from lungs
(R) To hear heart beats of baby in the womb
(S) To help in blood pressure measurement
A. Q and S
B. R and S
C. Q, R and S
D. P, Q, R and S
View Answer
D
39. A block of ice melts faster when kept in water compared to when kept in air. This is because_____.
A. water absorbs heat faster than air
B.. ice dissolves in water
C. melting point of ice increases in water
D. air has more heat than water
View Answer
A
40. If all plants disappear from earth which of the following would happens first?
A. Oxygen levels would drop
B.. Water would disappear
C. Soil formation would stop
D. Temperature on earth would increase
View Answer
A
41. If you burn a piece of wool, it smells like burning hair. What does this tell us?
A. Wool is made of cellulose
B. Wool contains proteins
C. Wool contains starch
D. Wool is a synthetic fibre
View Answer
B
42. People who travel to high altitudes sometimes experience bleeding through nose, what does this suggest?
A. Change in Temperature
B. Wool contains proteins
C. Change in Humidity of the air
D. Change in Temperature and humidity
View Answer
B
43. Identify the characteristics of high mountain plants
A. Change in Temperature
B. Deep roots, lots of branches
C. Slopping branches, conical shape
D. Air pockets in stem and leaves
View Answer
C
44. Find the ratio of tension T1 and T2 in the given diagram:
A. 7:2
B. 7:5
C. 5:2
D. 2:5
View Answer
B
45. Who amongst the following gets maximum fibres from food?
A. Every day Amey takes fish for lunch
B. Radhika eats leafy vegatables regularly
C. Ramesh enjoys sugarcane juice
D. Ira likes white rice in her meals
View Answer
B
46. What type of motion will be observed when a ball thrown straight vertically upward and it comes down
A. Uniform linear motion
B. Nouniform curved motion
C. Nouniform linear motion
D. Uniform curved motion
View Answer
C
47. In layer tinted method of drawing a map, what does dark green color indicate?
A. Water body
B. Land at a greater height
C. Land adjoining a water source
D. Land at the maximum height
View Answer
C
48. A family in a village uses cow dung cakes for cooking. Their neighbour installs a LPG cylinder instead. Which advantage does LPG have over dung cake?
A. It is cheaper than dung cake
B. It causes less indoor pollution
C. It is available in unlimited amounts
D. It is renewable fuel
View Answer
B
49. Identify the example of an induced magnet.
A. Pins are attracted to the nail when magnet is rubbed over it.
B. Pins are attracted when a copper wire is wound around a nail and is attached to a battery source.
C. Pins are attracted to a nail kept in vicinity of a magnet
D. All of the above
View Answer
C
50. Doctors use plaster cast to support and immobilize fractured bones to allow it to heal properly. Which property of bones helps this process?
A. Bones are flexible
B. Bone is a living tissue
C. Bones are elastic
D. Bone is soft tissue
View Answer
B
REMEMEBER:
Solving sample papers is one of the most important things students must do during their preparation.
Why is this Exam Important?
Students who prepare seriously gain:
- Strong science fundamentals
- Better analytical thinking
- Confidence in practical work
- Experience with research projects
- Preparation for future Olympiads and competitive science exams
- Improved presentation and interview skills
Preparation Strategy for Class 6
1. Study the Textbooks Thoroughly
Focus mainly on:
- Class 6 Science
- Revise Classes 4 and 5 Science
2. Solve Previous Year Papers
This helps you understand:
- Question style
- Difficulty level
- Time management
3. Practice Science GK
Topics include:
- Famous scientists
- Space
- Environment
- Human body
- Animals and plants
- Everyday scientific facts
4. Perform Simple Experiments
For example:
- Floating and sinking
- Magnetism
- Plant growth
- Water filtration
- Air pressure
5. Improve Observation Skills
Practice:
- Diagrams
- Graphs
- Experimental setups
- Scientific instruments
