Three similar light bulbs are connected to a constant voltage d.c supply as shown in the diagram. Each
bulb operates at normal brightness and the ammeter
(of negligible resistance) registers a steady current.
The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?
|Ammeter reading||Bulb brightness|
The correct answer should be D because when current decreases,brightness also decreases
Which of the following statements is incorrect regarding volcanoes?
A Active volcanoes can erupt anytime or has erupted in the recent past.
B Dormant volcanoes are the ones that have erupted long ago in the past but are now quiet and may erupt in the future.
C Extinct volcanoes are those that have been inactive for thousands of years.
D None of these
it will be D
Refer to the given word grid and select the option that is hidden in the given word grid.
A It is a light weight rock that has many holes in it.
B The main mineral present in this igneous rock is quartz.
C It is a metamorphic rock made from limestone.
D It is an energy mineral, also known as black gold.
X is one kind of permanent teeth which helps to crush the food. Select the option that
gives name of X on unscrambling.
Which of the following statements regarding pinhole camera is/are not correct?
(i) Pinhole camera forms real image.
(ii) Principle of image formation in pinhole camera is rectilinear propagation of light.
(iii) Pinhole in a pinhole camera acts as the lens.
B(i) and (ii)
C(ii) and (iii)
DNone of them
Refer to the given diagram of human male reproductive system and select the incorrect statement regarding parts X, Y and Z.
AZ deposits sperms into the vagina of female during coitus.
BY is similar in function to ovaries of female
CX conducts sperms from testis to urethra.
DY lies within scrotum in the abdominal cavity.