NSO - Mock Test - 1

The series is going up in cubes of continuous numbers, starting with the cube of 3.
10 + 3³ = 37
37 + 4³ = 101
101 + 5³ = 226
226 + 6³ = 442

EMPTY is coded as FOSXD using the pattern:-
E + 1 = F
M + 2 = O
P + 3 = S
T + 4 = X
Y + 5 = D

In the same way, STRING will be coded as TVUMSM:-
S + 1 = T
T + 2 = V
R + 3 = U
I + 4 = M
N + 5 = S
G + 6 = M

The relation between EFRT and GJXB is as follows:-
E + 2 = G
F + 4 = J
R + 6 = X
T + 8 = B

In the same way, DNSL : FRYT
D + 2 = F
N + 4 = R
S + 6 = Y
L + 8 = T

The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common hydrogen isotope, protium, has no neutron in the nucleus.

CH₃COOH is a weak acid while NaOH is a strong base. So one equivalent of NaOH cannot be neutralised with one equivalent of CH₃COOH. Therefore, the salt formed is basic and the solution will have a pH greater than 7.

The bases which dissociate in aqueous solution to produce one hydroxyl ion per molecule of the base are called monoacidic bases.
For example: NaOH, KOH, NH₄OH
NaOH ⇔ Na⁺+ OH^-

NH₄Cl is separated from NaCl by heating the solid mixture in a test tube. NH₄Cl, being sublime, changes into vapour which can be collected by cooling.
NaCl remains in the test tube.

Non-commercial energy sources include fuel wood, straw and dried dung. These are commonly used in rural India. According to an estimate, the total availability of fuel wood in India was only 50 million tonnes a year. It is less than 50% of the total requirement. In coming years, there would be a shortage of fire wood.

In precipitation reaction, when a product formed by the displacement of anion or cation in the solution surpasses its point of saturation, then it precipitates as solid at the bottom of the solution.
For example: 2KI + PbSO₄ → PbI₂ + K₂SO₄
Here, lead and potassium are displaced from their compounds to form lead iodide that precipitates at the bottom of the container.

2Fe (s) + 3H₂O (g) → Fe₂O₃ (s) + 3H₂ (g)

Iron reacts with steam when red hot to form iron oxide and hydrogen gas.

Vitamin C is also known as ascorbic acid or L-ascorbic acid.
It is a vitamin found in fresh fruits and vegetables, particularly citrus fruits and also taken as a dietary supplement.

The limitations of Mendeleev's periodic table are as follows:
1. Anomalous pairs, e.g. Co is placed before Ni even though Ni has a lower atomic mass.
2. Position of hydrogen is controversial as it resembles both alkali metals as well as halogens in many characteristics.
3. Position of isotopes is controversial as they were given the same slot, even though they have different atomic masses.
However, the noble gases could be accommodated in Mendeleev's table when they were discovered without disturbing the existing order.

The scattering of light by the particles in a colloidal solution is called Tyndall effect. The phenomenon makes the path of the light through the medium visible. It is named after John Tyndall, the scientist who first observed it.

Rb (Rubidium) is an alkali metal and it belongs to the group IA of the modern periodic table.

Holozoic nutrition is a type of heterotrophic nutrition. The term is derived from two Greek words, 'bolos' meaning 'whole', and 'zoic' meaning 'animal'. Thus, it can be defined as the feeding of complex organic matter by ingestion, which is subsequently digested and absorbed. Amoeba, paramecium, frogs and human beings show this type of nutrition.

Synaptic transmission relies on the availability of the neurotransmitter; the release of the neurotransmitter by exocytosis; the binding of the postsynaptic receptor by the neurotransmitter; the functional response of the postsynaptic cell; and the subsequent removal or deactivation of the neurotransmitter.

The mitochondrion is responsible for the production of ATP. Hence, high number of mitochondria gives enough energy for the process.

In some organisms, the unfertilised egg can develop into a new individual. This type of development without fertilisation is called parthenogenesis. Examples: Rotifers, drones of honeybees, etc.

Testosterone is the primary male sex hormone and an anabolic steroid. In men, testosterone plays a key role in the development of male reproductive tissues such as the testis and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

In turtles, males are predominant below 25^oC and females above 30^oC.

Each cell consists of two copies of chromosomes, one each from male and female parents. Meiosis produces germ cells which take one chromosome from each pair. Thus, germ cells consist of only a single set of genes.

The ability to absorb and re-emit infrared energy makes CO₂ an effective heat-trapping greenhouse gas.

Gene banks are a type of biorepository which preserve genetic material. For plants, this could be by freezing cuttings from the plant, or stocking the seeds (e.g. in a seedbank). For animals, this is the freezing of sperm and eggs in zoological freezers until further need. This is the best way to preserve the gene pool of endangered species so that it could be used in future.

OTEC stands for Ocean Thermal Energy Conversion. The difference in temperature between warm surface waters heated by the sun and colder waters found at ocean depths is another form in which solar energy becomes available from the oceans. This is called ocean thermal energy.

A biodiversity hotspot is a biogeographic region with a significant reservoir of biodiversity that is under threat from humans. A hotspot is an area which faces serious threat from human activities and supports a unique biodiversity (endemic, threatened, rare species) with representatives of evolutionary of speciation and extinction.

Choroid is the pigmented vascular layer of the eyeball between the retina and the sclera.

In case of the plane mirror, the object distance from the plane mirror is always equal to the image distance from the mirror.

So, the distance covered by the both object and image in a given time interval is same and they will approach each other with the same speed.

Hence, the speed of the image as observed by the object is
v_io = v + v = 2v

In order to produce unidirectional force (or torque) on the armature conductors of a motor, the conductors under any pole must carry the current in the same direction at all times.
The function of commutator and brush gear in a DC motor is to cause the reversal of current in a conductor as it moves from one side of a brush to the other.

A soft iron core can be used to increase the intensity of the magnetic field in an electromagnet because soft iron core is a magnetic material. When the magnetic field lines of the electromagnet pass through the iron core, it gets magnetised. Hence, the total magnetic field in the electromagnet is the sum of the magnetic field due to the iron core and the magnetic field also due to the electric current in the coil.

The value of the solar constant is 1.4 kJ m^-2

The reaction is exothermic and the solution is basic and will turn red litmus blue.
Hence, the pH of lime water is more than 7.

1. When the object is at infinity, the image is formed at F as the object approaches the mirror. When it is at 2F, its image is formed at 2F. In this case, the distance travelled by the image is just F (2F - F) as the object moves from infinity to 2F. Hence, the distance travelled by the object is more as compared to its image, so the speed of the object is more than the speed of its image.
2. When the object is at centre of curvature, its real and inverted image of the size as that of the object is formed at the centre of curvature.
3. When the object is in between pole and F, virtual and enlarged image is formed.
4. When the object is at centre of curvature, its real and inverted image of the size as that of the object is formed at the centre of curvature and when the object is at F, its image is formed at infinity. As the object moves form 2F to F, its image moves from 2F to infinity. Hence, the distance travelled by the object is less as compared to its image, so the speed of the object is less than the speed of its image.

The correct statements are as follow:

1. Metals have 1 to 3 electrons in the valence shell and non-metals have 4-8 electrons in their valence shell.
2. Metallic oxides give bases on reaction with water and non-metallic oxides give acids on reaction with water.
3. Among the metals, the more electropositive metals displace the less electropositive metals from their salts.
4. Non-metals accept electrons to attain a stable configuration and form anions.
5. Metals like Au and Pt are less reactive and do not form oxides.

The acceleration is less than 'g' since the falling magnet will generate an induced current in the copper ring and the induced current will oppose the motion of the magnet.