NEET Unit Test - 7 - NEET MCQ

The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 
All electromagnetic radiation is light, but we can only see a small portion of this radiation—the portion we call visible light. Cone-shaped cells in our eyes act as receivers tuned to the wavelengths in this narrow band of the spectrum. Other portions of the spectrum have wavelengths too large or too small and energetic for the biological limitations of our perception.
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.
 

Weather forecasting makes use of the infrared radiation emitted by cloud formations, which can be captured and transmitted by weather satellites as images to meteorologists.

Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) wavelengths, but relatively short for radio waves. Microwaves have wavelengths approximately in the range of about one meter to one millimeter; with frequencies between 300 MHz (1 m) and 300 GHz (1 mm).

The orderly distribution of electromagnetic radiations according to their wavelength or frequency as called the electromagnetic spectrum. Radio waves are electromagnetic waves of the frequency range from few Hz to 10⁶ Hz.

Infra red rays are basically heat radiation that gives warmth which support the plant growth. It also helps in treating muscle pain in the same way we use hot water massage for muscle cramps.

Assume the mirror is at the origin and it is moving about the origin along x direction between x = -2 and x = +2 as its extreme positions.
Assume that the object is placed at co=ordinate of x = - (2+x)
So, when mirror is at position x = -2, the object's image will be formed at x coordinate X = - 2+x 
And when the mirror is at position x = +2, the image is formed at X = 6+x 
So, the net difference in the position of image between these 2 co-ordinates is ( 6 + x  ) - ( -2 + x ) = 8
So, the amplitude will be half of this distance. So the answer is 8/2 = 4 cm. 
Option C is correct.
 

The relation between actual time and given time is:
Actual time=11:60 −given time
Actual time=11:60−3:25=8:35

According to the law of reflection, the angle of incidence and angle of reflection are equal. Both these angles are measured with respect to a line normal to the reflection surface. If I understand the question correctly, the incident ray makes an angle of 60 degrees with the mirror surface, then the angle of incidence can be calculated as:

Angle of incidence = 90 - angle made with the mirror surface

= 90 - 60 = 30 degrees.

Since, angle of incidence = angle of reflection = 30 degrees.

The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface).

The reflected ray will make an angle of 60 degrees (90 - 30 degrees) with the mirror surface.

For real object and real Image,
(1/v)+(1/u)=(1/f)=> -(1/v)-(1/u)=-(1/f)
(1/v)+(1/u)=(1/f) => 1/v=-(1/u)+(1/f)
y=mx+c
The correct answer is option B.

Energy of a wave is proportional to the frequency of the wave which remains the same in every medium. Hence there is no loss of energy. So, the reason is true.

(a) Speed of light in glass is c/μ=2×10⁸m/s

(b) The speed of light in glass is not independent of the colour of light. The refractive index of a violet component of white light is greater than the refractive index of a red component. Hence, the speed of violet light is less than the speed of red light in glass. Hence, violet light travels slower than red light in a glass prism.

Consider werner’s theroy

[Ni⁰(CO)₄]
[Cr³⁺(NH₃)₂][Ni⁴⁺F₆]₃
[Ni²⁺(NH₃)₂][B⁺³F₄]₂
K₄[Ni⁺²(CN)₆]

The correct answer is Option D.
As HBr in the presence of a peroxide follows antimarkonikoff rule where the negative group should attach to the carbon having less no of hydrogen atoms.

When 1-propene reacts with hydrogen bromide in the presence of peroxide, the more electronegative atom which is bromine gets attached to the carbon atom which has more number of hydrogen atoms. This reaction is named as Anti-Markovnikov's reaction.

The correct answer is Option A.

Reimer Tiemann reaction which converts phenol to ortho- hydroxybenzaldehyde involves the formation of dichlorocarbene which acts as an electrophile and attacks on the ortho position of phenol.

Since monochlorinated compound is formed so that menas all the hydrogens are same.

Carboxylic acids are more acidic than phenols as the carboxylate ion, the conjugate base of carboxylic acid is stabilized by two equivalent resonance structures. Thus, the negative charge is delocalized effectively. However, in phenols, negative charge is less effectively delocalized over oxygen atom and carbon atoms in phenoxide ion.

Along with DNA the cell also consists of various macromolecules such as lipids, RNA, polysaccharides. A macromolecule is a large molecule that is formed by polymerization of monomers. A macromolecule consists of more than 100 monomers.

The most commonly used bioreactors are of stirring type. Stirring type bioreactors are simple stirred-tank bioreactor and sparged stirred-tank bioreactor. 

Yeasts have been extensively used for functional expression of eukaryotic genes because they offer several advantages. Yeasts are the simplest eukaryotic organisms and like bacteria are single-celled, genetically well-characterised, easy to grow and manipulate. Since yeast is a eukaryote, it have an intron excision mechanism. Thus, it can be used for producing and expressing recombinant DNA of eukaryotes.

Use of genetically modified crops may increase crop production many times without use of chemicals and fertilizers. Gene coding form higher nutrient and resistance to disease can be incorporated in crop.

Isolated cells from plants that have had their cell walls digested and are surrounded by plasma membranes are called "protoplasts."

The attribute that is characteristic of a population and not an individual organism is the sex ratio. While an individual organism is either male or female, a population has a sex ratio that represents the proportion of males to females within the population. This attribute is specific to populations and provides insights into the demographics and reproductive dynamics of the population as a whole.

Option b) "Sex ratio" is the correct answer because it accurately identifies an attribute that is characteristic of populations.

In the given scenario, the laboratory population of fruit flies consists of 40 fruit flies, and during a specified time interval, 4 individuals died. To calculate the death rate, we divide the number of deaths by the total population.

Number of deaths = 4
Total population = 40

Death rate = Number of deaths / Total population
= 4 / 40
= 0.1 individuals per fruitfly per week

Option a) "0.1 individuals per fruitfly per week" is the correct answer because it accurately represents the death rate calculated based on the given information.

Natural selection operates on the population level to evolve desired traits. While individual organisms have to cope with changes in their environment, it is at the population level that natural selection acts to shape the genetic composition and traits of the population over time.

Population ecology, links ecology to population genetics and evolution. It is at the population level that variations in traits occur due to genetic diversity and interactions with the environment. Individuals with traits that confer advantages in survival, reproduction, and adaptation are more likely to pass on those traits to the next generation through interbreeding.

An age pyramid with a wide base and narrow top indicates a population that is growing rapidly.

In an age pyramid, the width of each age group represents the proportion or percentage of individuals in that specific age group. A wide base indicates a larger population of young individuals, while a narrow top indicates a smaller population of older individuals.

When the base of an age pyramid is wide and the subsequent age groups gradually decrease in width towards the top, it suggests that there is a higher proportion of young individuals compared to older individuals. This is indicative of a population that is growing rapidly because there is a high birth rate.

A population's birth rate refers to the number of births per capita. A population has birth rates and death rates, and these rates are expressed as changes in numbers (increase or decrease) with respect to members of the population.

To calculate the birth rate, the number of births is divided by the population size or the number of individuals in the population. The birth rate per capita provides a measure of the average number of births per individual in the population.