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
51. A person exerts a force of 10 N for 10 mins. But the box does not move from its place. Select the CORRECT option for the work done by that person.
A. Work = 10 N x 10 min
B. Work = 10 Joule
C. Work = 0 Joule
D. Work = 100 Joule
View Answer
C
52.Why do doctors check the colour of the skin and its texture during medical investigations?
P – To understand the age range
Q – Skin reflects the state of health
R – Skin reflects the mental health state
A. Only P
B. Only Q
C. Only R
D. P, Q and R
View Answer
B
53. Why tail of a comet is always directed away from the sun?
A. Due to gravitational force of earth
B. Due to sun’s heat
C. Due to rotation of earth
D.Due to gravitational force of moon
View Answer
B
54. ____ is a sac-like organ in human body which contains hydrochloric acid.
A. Liver
B. Stomach
C. Pancreas
D. Kidney
View Answer
B
55. Observe the water cycle shown in the given diagram and identify the process taking place at P, Q and R in sequence.
A. Precipitation, Evaporation, Condensation
B. Condensation, Precipitation, Evaporation
C. Evaporation, Condensation, Precipitation
D. Evaporation, Precipitation, Condensation
View Answer
C
56. Rabies primarily affects _______.
A. Stomach
B. Nerves
C. Lungs
D. Liver
View Answer
B
57. Select the CORRECT sequence of energy transformation in a running fan.
A. Electrical energy → Heat energy → Kinetic energy
B.Electrical energy → Wind energy → Kinetic energy
C. Electrical energy → kinetic energy → Heat energy helps in maintaining water balance of the body.
D. Kinetic energy → Heat energy → Electrical energy
View Answer
C
58. Riya and her six friends stay together in hostel room. Out of them (1) preeti is suffering from anemia(2) shashi is suffering from scurvy (3) Nidhi is suffering from dust allergy (4) Swati is suffering from common cold from whom can Riya catch infection?
A. Preeti
B. Shashi
C. Nidhi
D. Swati
View Answer
D
59. You are designing a vegetable cutter for your school canteen. Which of the following combination of simple machines you will select to increase the efficiency?
A. Pulley and Wheel
B. Lever and Wedge
C. Inclined plane and screw
D. Wedge and Pulley
View Answer
B
60. P- Fatty substances, Q- cereals and pulses, R- Meat, fish and eggs, S- fruits and vegetables. Select the CORRECT option showing the proper proportion of the above food components for a balanced diet.
A. Q > S > R > P
B. P > Q > S > R
C. S > P > Q > R
D. S > Q > R > P
View Answer
D
61. If we blow across the open mouth of an empty bottle, we can hear a sound. Pitch of sound changes when we fill the bottle with water because _______.
.
A. Weight of the bottle increases with water
B. Size of the air column in the bottle decreases
C. Size of the air column in the bottle increases
D. Air enters the water filled in the bottle
View Answer
B
62. Water is essential for moving food through alimentary canal. One may suffer from ___ if water intake is reduced.
A. constipation
B. giddiness
C. weakness
D. diabetes
View Answer
A
63. Identify the INCORRECT pair of the artificial satellite and its purpose:
A. Chandrayaan – 1 Discovery of water on the surface of the moon
B. Chandrayaan -2: soft landing on the surface of the moon
C. . Chandrayaan -3: safe landing on the north pole of the moon
D. Mangalyaan – 1: To study Mar’s surface and atmosphere
View Answer
C
64. In the following Venn diagram, identify the animal at position X reference to human beings.
A. Grasshopper
B. Ant
C. Earthworm
D. Snake
View Answer
C
65. Nitrogen gas is filled while packing wafers because ____.
A. wafers turn yellow because of nitrogen gas
B. nitrogen does not react with wafers
C. nitrogen increases the weight of the packet
D. nitrogen helps in oxidation process
View Answer
B
66. Identify the fat-soluble vitamins from the following
A. A, B, C, D
B. A, D, E, K
C. A, B, C, K
D.A, B, D, K
View Answer
B
67. What a most likely, if the moon stops rotating around the earth?
A. Day and night won’t be on Earth
B. High and low tides won’t be on Earth
C. There will be no season on earth
D. Always full moon will be visible from earth
View Answer
B
68. The given bar diagram represent the number of plants, caterpillars and Grasshoppers in ecosystems P, Q and R respectively. Observe the bar diagram and select the CORRECT option.
A. Number of caterpillars in ecosystem R and P are equal
B. Number of plants in ecosystem Q is maximum
C. Food chain in ecosystem P is balanced
D. Food chain in ecosystem Q is balanced
View Answer
C
69.Who am I?
I am an annual plant. There are nodules on my roots. My seeds and leaves are edible.
A. Coriander
B. Cucumber
C. Green peas
D. Gram
View Answer
D
70. A farmer stores water in an open tank in summer. After a few days, green algae start growing in it. Which condition most likely causes this?
A. Lack of oxygen in water
B. Presence of sunlight and nutrients
C. Very low temperature
D. Very high temperature
View Answer
B
71. Which of the following processes does not happen with the help of microbes?
A. Formation of curd from milk
B. Spoilage of food
C. Sprouting of pulses
D. Making of idli
View Answer
C
72. In winter, Anil wears woolen clothes. Wool keeps him warm mainly because ___________.
A. Wool absorbs moisture from air
B. Wool traps air, air is a bad conductor of heat
C. Wool allows heat to pass easily
D. Wool is semiconductor of heat
View Answer
B
73. Which of the following animal is NOT arboreal in habit?
A. Tiger
B. Monkey
C. Chameleon
D. Squirrel
View Answer
A
74. Who am I?
I live in several years. I give more oxygen as compared to others. I bear leaves throughout the year
A. Banyan
B. Banana
C. Bamboo
D. Tamarind
View Answer
A
75. A magnet is divided into three equal parts as shown in the figure. Identify the CORRECT option showing the poles of magnets formed at position P, Q, R and L.
A. N N S N
B. S N S N
C. N N S S
D. S S N N
View Answer
B
76. Identify the CORRECT preventive measure for diseases.
A. Maintaining physical and social hygiene
B. Timely vaccination
C. Balanced diet
D. All of these
View Answer
D
77. While pulling a box over a ramp, students observed that it is sliding backwards. Which alteration in the design of the ramp will help students pull the box easily?
A. Decreases the angle of the slope of the ramp
B. Increase the angles of the slope of the ramp
C. Make the ramp surface smooth
D. Increase the width of the ramp
View Answer
A
78. Famous Himru shawls from Chhatrapati Sambhaji Nagar are made of which thread?
A. Silk and cotton thread
B. Pure silk threads
C. Pure silk and silver threads
D. Silk and nylon threads
View Answer
A
79. The slope of distance – time represents _____.
A. Distance
B. Displacement
C. Time
D. Speed
View Answer
D
80. Refer to the Venn diagram. The plant X can be ______
A. Mustard
B. Coriander
C. Clove
D. both (A) and (B)
View Answer
C
81.Who am I?
I am a leaf that grows under ground. I am ball shaped. I store food in my leaves.
A. Potato
B. yam
C. Beetroot
D. Onion
View Answer
D
82.If a student passes across the projector in the classroom, why is this shadow casted on the screen
A. Light travels in a straight line
B. Scattering of light
C. Reflection of light
D. Divergence of light
View Answer
A
83. What are the physical benefits of outdoor games?
A. Regulates body weight
B. Helps to gain mental ability
C. Enhance creativity
D. Develops leadership qualities
View Answer
A
84. Select the CORRECT option for exchange of gases in green plants.
View Answer
C
85. Select the CORRECT option for exchange of gases in green plants.
A. Himalaya
B. Aravali
C. Vindhya
D.Satpuda
View Answer
B
86. What will happen if like magnetic polarity is set between the wheels and tracks of a moving maglev train?
A. Speed of the train will decrease
B. Speed of the will increase
C. Train will stop immediately
D. Speed of the train will not change
View Answer
B
87. Which of the following is a nonflowering plant?
A. Cycas tree
B. Umber tree
C. Cactus plant
D.Curry tree
View Answer
A
88. Unit ‘Light Year is a measure of______.
A. time
B. distance
C. intensity of light
D. speed of light
View Answer
B
89. The picture shows a girl riding the bicycle. She completes one round in one minute. Which type of motion is shown by her?
A. Nonlinear motion
B.. Oscillatory motion
C. Circular motion
D. Periodic motion
View Answer
D
90. In a laboratory a scientist observes a sample under the microscope. She finds single called organisms with no well-defined nucleus. These organisms survive in extreme hot springs. Which kingdom should they be classified into?
A. Monera
B.. Protista
C. Algae
D. Fungi
View Answer
A
91. Identify the first tiger reserve of Maharashtra.
A. Tadoba
B. Bor
C. Melghat
D. Chandoli
View Answer
C
92. Increase in the production of ______ is called Blue revolution.
A. Makhana
B. Rice
C. Fish
D. Sugarcane
View Answer
C
93. What is the name of the renowned animal rescue center established by famous Indian businessman?
A. Animal Ark, Hemalkasa
B. AnimalAid, Udaipur
C. Vantara, Jamna
D. People for animals, New Delhi
View Answer
C
94. Who is president of national Disaster Management Authority(NDMA)?
A. President
B. Prime minister
C. Governor
D. Chief minister
View Answer
B
95. Why do astronaut wear space suits
A. To breathe in space
B. To protect from harmful radiation
C. To regulate body temperature
D. All of the above
View Answer
D
96. Select the CORRECT option to record your observation about the toothed wheels in the diagram which are in motion.
- Wheel S and wheel T are moving in clockwise direction
- Wheel S and wheel T are moving in opposite direction
- By the time wheel S completes one rotation, wheel T completes two rotations
- H. By the time wheel S completes two rotation, wheel T completes one rotation
A. E and G
B. F and H
C. E and H
D. F and G
View Answer
B
97. It takes 12 years for Jupiter to complete one revolution around the sun. if you are celebrating your birthday today on Jupiter, your next birthday on Jupiter will fall in which calendar year on Earth?
A. 2026
B. 2036
C. 2025
D. 2037
View Answer
D
98. Gaganyatri Shunshu Shukla conducted 7 experiments in space. One of these was to study the sprouting of _____ and ____ .
A. Ragi and corn
B. Methi and moong
C. Mustard and beans
D. Jowar and chana
View Answer
B
99. India ‘s first dark sky reserve is situated at which of the following places?
A. Kutch
B. Jaisalmer
C. Ladakh
D. Nicobar
View Answer
C
100. Two pulleys are shown in the figure. If a weight of 40 kgs is attached to the pulley X, calculate the weight to be applied at position ‘P’ to lift the weight.
A. 20kg
B. 40kg
C. 60kg
D. 80kg
View Answer
A
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
