OSSSC TGT Science PCM Mock Test - 4 - OTET MCQ

Motor development is a physiological process in which motor activities are learned by children and taken into practice leads to permanent behaviour change. It is divided into two skills: gross motor development, that is, development of large muscle and fine motor development, that is, development of short muscle. This is how motor development controls body movements.
Hence, the correct answer is "Development of control over body movements".

Arnold Gesell gives the Maturational Theory. He explained that mature is a genetic factor, and it plays an important role in children's development; the influence of the environment is not more important than genes. Children take birth by genes; their habits are like their parents, their sitting posture, how they eat, how they walk, etc., all depends on their parents. He believes that development is a biological process that occurs automatically in sequential stages, which means genes play an important role in developing a child.
Hence, the correct answer is "Maturational Theory".

IQ is a score obtained by conducting an Intelligence Test. Intelligence involves different mental activities and abilities which include logic, reasoning, planning, and problem-solving. So IQ between 90 to 110 is considered as normal. This proves that this is normal and people having IQ between 90 to 110 can understand everything, able to do planning, reasoning, etc.
Hence, the correct answer is "Normal".

Learning is a process where we live, talk with others, learn new things which means we are interacting with others, and learning different skills like sitting, walking, eating, etc. We gain knowledge of what we are not aware of and also learn various skills that help us in the future.
Hence, the correct answer is "All of the above".

The magnetic field at the center O due to the upper side of the semicircular current loop is equal and opposite to that due to the lower side of the loop.

Potential gradient Is given by V/l. If V and l are constant, the potential gradient also remains constant. The change in the radius will cause a change in the current. This does not change the potential gradient.

Sensitivity of the potentiometer means the smallest potential difference it can measure. It can be increased by reducing the potential gradient. The same is possible by increasing the length of the potentiometer. Hence the correct option is option C.

Gamma-ray photons have the highest energy in the EMR spectrum and their waves have the shortest wavelength. Scientists measure the energy of photons in electron volts (eV). X-ray photons have energies in the range 100 eV to 100,000 eV (or 100 keV). Gamma-ray photons generally have energies greater than 100 keV.

Any line joining the object point and the image point always passes through the centre of curvature of the mirror. This is because of the law, that any ray passing through the centre of curvature of the mirror will retrace its path back.
Thus, any ray passing through the centre of curvature will be perpendicular to the mirror irrespective of the type of the mirror used.

Because Presence of two coherent sources of radiation is one of the PRIME CONDITIONS FOR INTERFERENCE.

The electromagnetic wave travels in vacuum along z-direction. Then, the electric field vector and magnetic field vector will be in the XY plane.
Frequency of the wave = 30 MHz
Converting into Hz, v = 30× 10⁶ Hz.
speed of light, c = 3 × 10⁸ m/s
Wavelength of the wave can be calculated using the following relation:
λ = c/v
⇒ λ = 3 × 10⁸/30 × 10⁶
⇒λ = 10 m

∴ d = 2f₁ + f₂ 

This 'bending of a ray of light' when it passes from one substance into another substance is called refraction. The bending of a ray of light also occurs when the ray comes out of glass or water and passes into air.

When either calcium sulphate or magnesium bicarbonate or calcium chloride is dissolved in water, hard water is obtained. Hard water is due to presence of sulphates, chlorides or bicarbonates of magnesium and calcium in water. 

Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation. Simple distillation is used when the boiling points of chemicals in a mixture having large differences (more than 25°C). Fractional distillation is used when the boiling points of chemicals in a mixture are close to each-other, usually within 77°F (25°C). Fractionating columns used to separate the mixtures.

The correct option is C.
Zero on the Celsius scale (0°C) is the equivalent to 273.15K. 1-degree rise in Celsius scale is equivalent to the 1-degree rise in the Kelvin scale.
 Conversion Formula for the temperature is:C=K−273
300-273= 27 C

There is lot of empty space on the unit cell, hence metallic bond is weaker. Thus sodium and potassium appear soft and can with knife. 

Because sodium hydroxide is a type of chemical and when we add it to water than this will be a chemical activity.

The reaction in which an element or molecule is added to unsaturated hydrocarbons is called addition reaction.

Fluidity is the ability of matter of not having a definite shape. Liquids such as water occupy the shape of the container in which they are kept that means they don't have a fix shape so they are called fluids. Gases are also considered fluids. 

Three face cards from spades have been removed.
Total cards=52-3=49
Total No of black face cards=3+3(3 in each spades and clubs)
Remaining black face cards=6-3=3
Probability of getting black face card=  no. of favourable outcomes/ total no. of outcomes=3/49

In ΔQAB, OA = OB [both are the radius of a circle]
∠OAB = ∠OBA ⇒ ∠OBA = 40°
[angles opposite to equal sides are equal] Also, ∠AOB + ∠OBA + ∠BAO = 180°
[by angle sum property of a triangle]
∠AOB + 40° + 40° = 180°
⇒ ∠AOB = 180° – 80° = 100°
We know that, in a circle, the angle subtended by an arc at the centre is twice the angle subtended by it at the remaining part of the circle.
∠AOB = 2 ∠ACB ⇒ 100° =2 ∠ACB
∠ACB = 100°/2 = 50°

Hence, the ratio is 1:2 and the division is internal.

Set P is square of the element of set Q.
{(x, y): x is the square of y, x ∈ P, y ∈ Q}

Using the result, HCF × LCM = Product of two natural numbers ⇒ the other number =  product of two no. = LCM *HCF
Let unknown no. = X
>> X * 27 = 9*459
X = 9*459/27
X = 153

So X= 

So option B is correct answer. 

(a) The collection of all months of a year is a well-defined collection of objects because one can definitely identify a month that belongs to this collection. Hence, this collection is a set.

(b) A collection of novels is not a well-defined collection because one cannot identify a book that belongs to this collection. Hence, this collection is not a set.

(c) A collection of top rich persons can not be defined. Hence, this collection is not a set.

(d) The collection of the ten most talented writers of India is not a well-defined collection because the criteria for determining a writer's talent may vary from person to person. Hence, this collection is not a set.

y²+3=2(2x+y) represents parabola.
y²+3=4x+2y
y²−2y+3=4x
y²−2y+1+3=4x+1
(y−1)²=4x−2
(y−1)²=4(x−1/2)
So, the vertex of parabola=(1/2,1) and axis is parallel to x axis.
a=1
Focus=(1/2+1,1)
=(3/2,1)