User Forum

If and ab ≠ 0, then is equal to _______.

(A)

(B)

(C) 1

Read the given paragraph with few blanks in it.
During the process of cloning Dolly, a cell was collected from the ______ of a ______ ewe and an egg was collected from ______ ewe and was enucleated. The nucleus from the mammary gland cell was taken, and inserted into this enucleated egg and the egg (______) was implanted into the ______ ewe which gave birth to Dolly after due time. Now select the option that will correctly fill the blanks in the above paragraph.

AOvarian follicle, Finn Dorsett, Scottish blackface, haploid, Finn Dorsett
BOvarian follicle, Scottish blackface, Finn Dorsett, diploid, Finn Dorsett
CMammary gland, Finn Dorsett, Scottish blackface, diploid, Scottish blackface.
DMammary gland, Finn Dorsett, Scottish blackface, haploid, Finn Dorsett

Refer to the given figures which show three different types of fission. Select the option which correctly matches them with the organism in which they occur.


--------(i)---------------------(ii)-----------(iii)
AEuglena--------Plasmodium---Amoeba
BPlasmodium---Paramoecium---Euglena
CParamoecium---Plasmodium---Euglena
DEuglena----------Paramoecium---Amoeba

Plant X is a vascular and invasive plant species that grows densely over the surface of a lake at a very high rate, due to pollution in water. It has been linked to oxygen depletion of the water, in spite of the fact that it is photosynthetic. Which of the following accounts for this contradiction?

AWhile being photosynthetic, X consumes oxygen at a faster rate than it releases the same, because of its high rate of growth.
BBecause X is highly invasive, it incorporates a large quantity of oxygen in its biomass.
CWhen X dies, the bacteria that decompose its dead body consume the oxygen dissolved in water and grow rapidly.
DNone of these

The given figure shows a small positively charged sphere O, kept in between two larger positively charged spheres X and Y which are fixed.

In which direction will the sphere O move?

AUp
BDown
CLeft
DRight

The loudness of sound coming from murmur in a quite library is about 30 decibel while that from a car horn is about 120 decibel. The ratio of the amplitudes of vibrations producing these sounds is

A1 : 1
B1 : 2
C1 : 4
D1 : 16

An object vibrates 7200 times in 8 minutes. A girl standing close to the object hears

A

B

C

DNo sound.

The distance of Alpha Centauri from Earth is about 4.3 light years. The time taken by the light to reach Earth from Alpha Centauri is about

A1.35 × 10⁶ s
B1.35 × 10⁷ s
C1.35 × 10⁸ s
D1.35 × 10⁹ s

The given figure shows a girl standing in a garden under the sun.
Which of the following graphs best represents the variation of the length of her shadow with time?
        

A
B
C
D

Read the given statements and select the correct option.
Statement 1: Groundwater is safe for drinking.
Statement 2: Groundwater is free from soluble impurities.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is correct but statement 2 is incorrect.
DBoth statements 1 and 2 are incorrect.