Exam Dr. Homi Bhabha Balvaidayanik Exam [DHBBVC] Institute The Greater Bombay Science Teachers Association [MSTA] Download Theory and Practical Question Papers Document Type PDF Official Website https://msta.in/

## MSTA Dr. Homi Bhabha Balvaidayanik Exam

Dr. Homi Bhabha Balvaidnyanik Competition is conducted by Greater Bombay Science Teachers’ Association [MSTA] since 1981. This unique four stage competition aims at arousing curiosity, problem solving attitude along with development of precision in observational and motor skills in young scientists. Through the competition GBSTA also aims at sensitizing students towards their immediate environment and dare to take rational initiatives whenever needed.

Download Dr. Homi Bhabha Balvaidayanik Exam [DHBBVC] Theory and Practical Question Paper Here

## MSTA Dr. Homi Bhabha Balvaidayanik Exam Sample Questions

Practical Skills Test – Standard IX – Physics

Sample – 1:
Aim:
To establish the relation between the volume of a solid and thevolume of the liquid displaced by that solid.

Procedure:
(i) Measure the length, breadth and thickness of the given solid (say, aglass chip) and write down your observations.
(ii) Calculate its volume.
(iii) Find the volume of water displaced by it, using the overflow vessel andmeasuring cylinder.

Question:
(i) State the relation between your observations in (ii) and (iii).
(ii) If you use kerosene, instead of water, will there be any change in theabove relation?
(iii) Does the density of the liquid have any impact on the above therelation? If so, mention it.
(iv)Instead of a solid with a regular shape, if you use a solid with anirregular shape, what would be its impact on the above relation?

Sample – 2:
Aim: To find relation between density of a solid and the location /position of the solid when it is introduced in water.

Apparatus:
Three small identical bottles (Bottle A-empty, Bottled B-halffilled with and Bottle C-completely filled with sand), other apparatus andmaterial.

Procedure and findings:
Proceed as follows and write down the answers to the questions.
(1) Introduce bottle ‘A’ in water. Observe whether it sinks in water or floatsover it and note down your observation.
(2) Repeat the above procedure using bottle ‘B’.
(3) Repeat the above procedure using bottle ‘C’.
(4) Mention the difference in position of bottles ‘A’, ‘B’ and ‘C’ in water.
(5) Is there any difference in masses of ‘A’, ‘B’ and ‘C’? If so, mention it.
(6) Is there in any difference in densities of ‘A’, ‘B’ and ‘C’? If so mention itgiving reasons for the same.
(7) From your observations, state the relation between the density of thebottle and its position in water.

Sample – 3:
Aim:
Study of Magnetic field.Note: Do the procedure as given below. Note down the observations asperthe procedure. Answer the questions given below.

Procedure:
1) Keep the given magnetic needle on the table. See its direction.
2) Keep the magnetic needle near point A of the given coil. See its direction.
3) Connect the coil to the cell. Observe the deflection of the red part of themagnetic needle. Disconnect the cell from the coil.
4) Keep the magnetic needle at point B of the coil. See its direction.
5) Now let the magnetic needle be at point B only and connect the cell tothe coil. Observe the deflection of the red part.Keep the cell connected.
6) Hold the given wooden stick in the coil. Observe the deflection of the redpart.
7) Hold an iron nail/pin in the coil. Observe the deflection of the red part.

Question:
1) When the coil is connected to the cell why does the magnetic needledeflect?
2) Give reasons for the effect on the deflection in the magnetic needlewhen magnetic and non- magnetic substances are kept in the coil.
3) On connecting the cell, the effect on the red part of the magnetic needleat points A and B is same or different?On this basis, what conclusion you will draw about the magnetic field atboth points.

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