Question

6. A person in a dark room looking through a window can clearly see a person outside in
the daylight. But a person outside cannot see the person inside. Why does this happen?
a. There is not enough light being reflected off the person in the room.
b. Light from the outside is not able to pass through windows at all.
c. Sunlight is not as intense as all other sources of light.
d. Light rays cannot pass through the same window twice.
7. A vaccine is used to improve immunity against a specific disease. A vaccine for a
disease contains dead or weakened microbes causing that disease. When introduced into
a healthy body, it triggers the production of antibodies. These specific antibodies
remain in the blood and can identify and attack the disease-causing microbes whenever
they enter the body again.
Which of the following can vaccines provide protection against?
a. only a viral disease
b. only a bacterial disease
c. only a fungal disease
d. any of these diseases
8. Here are a few substances that enter our body along with oxygen when we inhale air
nitrogen, carbon dioxide, dust particles
Which of the above do the hair and mucus in our nostrils help to filter out?
a. only dust particles
b. only nitrogen and carbon dioxide
c. only carbon dioxide and dust particles
d. all - nitrogen, carbon dioxide, dust particles

Answer 1

6.- a.
7.- d.
8. -d.

Answer 2

6 a
7 d
8 d may be ans