Matter in Our Surroundings — Science STD 9 — Question

When a force retards the motion of a body, the work done is:

The symbol of copper is:

The smell of the deodorant sprayed  on one side of the room travels to the other side of the room.This proves that:

Which of the following statements is true about the nucleus of a cell?

Four students A, B, C and D verified the law of conservation of mass by performing chemical reaction between barium chloride and sodium sulphate. All of them took 107.2g barium chloride solution and 116.1g of sodium sulphate solution and mixed them in the beaker of mass 150g. They reported their results as follows:

Students	Colour of reaction mixture after mixing	Mass of reation mixture in the beaker including mass of beaker
A	White Precipitate	383.3g
B	Brown Precipitate	393.3g
C	White Precipitate	373.3g
D	Brown Precipitate	363.3g

The correct observation is that of student.

The functional units of Golgi apparatus are:

Evaporation is a _______ phenomenon.

Short branched process coming out of a soma of neuron are:

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order:

1. Rutherford’s atomic model.
2. Thomson’s atomic model.
3. Bohr’s atomic model.

Vacuoles: