Question

d) gra
26. Power of concave mirror is
a) Negative
b) Positive
c) A and B
d) Non
27. What is the lens formula
a) 1/+1/u = 1/f b) 1/v-1/u = i/f c) a nd b
d) Nor
28. Who invented the Radio
a) Karl benz
b) Marconi
c) John Loud
29. What is the ore of Aluminium
a) Haematite
b) Argentite
c) Bauxite
d) Cu
30. Blood pressure is measured by
a) E.C.G
b) Stethoscope c) Sphygmomanometer d) Pu
31. Green house gas is
a) CO
b) Co2
c) H2s
d) CI
32. Haemoglobin is found in
a) Blood
b) Saliva
c) Gall bladder
d) Sv
33. Dengu fever is caused by
a) Influenza
b) Sall gems virus c) HIV
34. Vitamin K Deficiency may result in
d) A
a) Scurvy
b) Difficult in blootcloting c) Difficult in Breathing
35. What is the Difficiency of Vitamin B12
n Night blindness b) Scurvy
c) Anemia
d) N​

Answer 1

Explanation:

1 - Consider a point source placed at the focal point of a concave mirror. The initial vergence is then Vi = -1/f. The power of the surface is P = +1/f. The final vergence is thus zero.

...

2 - Convex lenses are also known as converging lenses since the rays converge after falling on the convex lens while the concave lenses are known as diverging lenses as the rays diverge after falling on the concave lens. Images formed by these lenses can be real or virtual depending on their position from the lens and can have a different size too.

3 - red blood cells

Hemoglobin, also spelled haemoglobin, iron-containing protein in the blood of many animals—in the red blood cells (erythrocytes) of vertebrates—that transports oxygen to the tissues.

4- Guglielmo Marconi

Reginald Fessenden

William Dubilier

5- Bauxite ore is the world's primary source of aluminum. The ore must first be chemically processed to produce alumina (aluminum oxide). Alumina is then smelted using an electrolysis process to produce pure aluminum metal. Bauxite is typically found in topsoil located in various tropical and subtropical regions.

6- Blood pressure is measured with an instrument called a sphygmomanometer. First, a cuff is placed around your arm and inflated with a pump until the circulation is cut off.