Atoms and Molecules — Science STD 9 — Question

On a hot summer day, speed of sound was recorded at Chennai and Delhi as v_c and v_d. Then:

Harelip is a:

1. Acquired disease.
2. Infectious disease.
3. Metabolic disease.
4. Congenital disease.

Most of the alpha particles go straight through the foil if it is passed through a thin metal foil. This is due to the reason that:

Which of the following group of plants is called vascular cryptogams?

1. Thallophyta.
2. Bryophyte.
3. Pteridophyta.
4. Angiospermae.

he mass of an object is a ​ measure of inertia:

Does the Law of Conservation of energy apply to machines?

Reproductive structure are flowers in:

1. Gymnosperms.
2. Pteridophytes.
3. Angiosperms.
4. Both (a) and (b).

Which of the following waves do not require any kind of medium to propagate?

The resultant of balanced forces is:

Seat of photosynthesis is:

1. Leuciplast
2. Chloroplast
3. Chromoplast
4. Both a and c