Mix Test - 6

Impending ovulation can cause an uptick in vaginal discharge. This discharge is often clear and stretchy — it may even resemble raw egg whites. After ovulation, your discharge may decrease in volume and appear thicker or cloudier.
Hence, the correct option is (B).

Echoes are heard due to the phenomenon of reflection of sound. So option (A) is correct. This happens when sound waves fall on a hard surface.

The sound power per unit area is termed as its intensity.

The pitch of a sound is a measure of how high or low a sound is based on its frequency.

Hence, the correct option is (A).

Kalahandi district in Odisha is famous for rice.

Rice:

• It is the staple food crop of a majority of the people in India.
• Our country is the second-largest producer of rice in the world after China.
• It is a Kharif crop that requires high temperature, (above 25°C) and high humidity with annual rainfall above 100 cm.
• In areas with less rainfall, it grows with the help of irrigation.
• Rice is grown in the plains of north and north-eastern India, coastal areas and the deltaic regions.

Hence, the correct option is (C).

The phenomenon in which a white light ray when falls on a prism get separated into its component colors is called dispersion of light. The band of the coloured components of a light beam is called its spectrum. 

A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by the dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun.

Hence, the correct option is (B).

Rayon is man-made fibres also called artificial silk.

• Rayon is a synthetic fibre whose properties are similar to that of silk.
• Rayon is obtained from a natural source like wood pulp. 
• It has a very shiny appearance and hence called artificial silk.

Natural Fibre: Natural fibres are the fibres that are obtained from plants, animals or mineral sources. Some examples are cotton, silk, wool etc.

Synthetic fibres: Synthetic fibres are man-made polymers designed to make a fabric. Polymers are obtained when many small units are joined together chemically. Some examples are silk, acrylic, rayon, dacron etc.

Hence, the correct option is (B).

In-Plant tissues, the cell walls of 'cork' are coagulated by 'suberin' which makes them impervious to water & gas molecules. 

Protective tissues: 

• These tissues provide fortification to the plant. 
• They include two basic things which are known as the 'epidermis & cork'.

The following table shows the components of protective tissues with respective features. 

Hence, the correct option is (B).

Kharif crops can be described as the crops which are sown with the beginning of the rainy season. 

Sowing of Kharif crops is done in the months of June-July. The monsoon rains begin from the month of June. Which provides a favorable environment for the Kharif crop. The winter season starts from November-December, at this time the Rabi crop is sown. Wheat, gram, pea, mustard, etc are the major Rabi crops. Paddy, Bajra, Jowar Millet, maize, etc. are the major Kharif crops.

Hence, the correct option is (D).

In science, a push or a pull on an object is called force.

Hence, the correct option is (C).

When coal burns in air then Carbon dioxide is formed. The burning of coal produces a solid waste called fly ash, which comprises silica, alumina, iron oxide and residual carbon along with toxic elements.

Hence, the correct option is (A).

Vision is not possible at the junction of the optic nerve and the retina, where there are no sensory cells. This junction is called blind spot.

Blindspot is a small area of the retina insensitive to light where the optic nerve leaves the eye. When the image of an object falls on the blind spot, it is not seen by the eye.

Hence, the correct option is (B).

Both Mitochondria & Chloroplast show similarity to a prokaryotic cell. Prokaryotic cells are single-celled microorganisms known to be the earliest on earth. Prokaryotes include Bacteria and Archaea. A prokaryotic cell consists of a single membrane and therefore, all the reactions occur within the cytoplasm. They can be free-living or parasites.

Hence, the correct option is (D).

The Asiatic wild ass is found in Rann of Kutch. The Rann of Kutch is located mostly in Gujarat in India and in some parts of Sindh, Pakistan. Arid areas of the Rann of Kutch are the habitat for wild ass. The Rann of Kutch is popular for migratory birds. During winter, birds, such as Siberian Crane come in large numbers at Rann of Kutch. Rivers such as Luni, Bhuki, Bharud, and Nara flow through Rann of Kutch.

The Rann of Kutch is home for:

• Chinkara (Gazella bennettii).
• Nilgai (Boselaphus tragocamelus).
• Blackbuck (Antilope cervicapra).

Note: The Thar Desert is the habitat for camels.

Hence, the correct option is (D).

When a body partially and fully emerged in any fluid it experiences an upward force that is equal to the weight of the fluid displaced by it and it is called buoyant force.

Hence, the correct option is (D).

The sound produced by a bat is Ultrasonic.

The longitudinal mechanical waves having frequencies greater than 20000 Hz are called ultrasonic waves. 

Applications of Ultrasonic Waves:

• For sending signals.
• For measuring the depth of the sea.
• For cleaning clothes, airplanes and machinery parts of clocks.
• For removing lamp-shoot from the chimney of factories.
• In sterilizing of a liquid.
• In ultrasonography.

Hence, the correct option is (D).

Petroleum, also called crude oil, is a fossil fuel. Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria.

Hence, the correct option is (D).