Punjab Police Constable Mock Test - 5 Free Online Test 2026

Factors affecting viscosity include temperature, density, and pressure. Higher temperatures decrease viscosity, whereas higher density and pressure increase viscosity.

Electron emission involves the release of electrons, while electron capture involves the capture of an electron by an atomic nucleus.

Thermionic emission refers to the emission of electrons from a metal surface due to heat.

The substance that gains electrons in a redox reaction is called the oxidizing agent.

The substance that loses electrons in a redox reaction is called the reducing agent.

Blue-green Algae or Cyanobacteria are Prokaryotes. They lack membrane-bound organelles and nuclei. 

The correct answer is (c) Cellulose.

The plant cell wall is primarily composed of cellulose, a complex carbohydrate. Cellulose is a polysaccharide made up of glucose units arranged in a linear fashion, forming long chains. These chains are interconnected to form a rigid and strong network, providing structural support to plant cells.

Lipids, such as fats and oils, are not a major component of the plant cell wall. Vitamins are organic compounds required in small amounts for various metabolic processes and are not a primary component of the cell wall. Proteins are present in the cell wall, but they are not the main constituent.

Therefore, cellulose is the main component of the plant cell wall.

The primary cause of nitrogen pollution is agricultural runoff (Option D). Excess nitrogen from fertilizers and animal waste used in agriculture can be washed into water bodies through runoff, leading to water pollution and ecosystem disruption.

The process that converts atmospheric nitrogen into a form usable by plants is nitrogen fixation (Option A). Nitrogen fixation is carried out by certain types of bacteria, which have the ability to convert atmospheric nitrogen into ammonia (NH₃) or ammonium (NH⁴⁺), which can be taken up by plants.

West Bengal achieved Geographical Indication (GI) tags for various products, including Sundarban honey, Black Nunia rice, and Tangail, Gorod, and Kadiyal sarees, in the National GI Drive Mission.

Rashmi Govil, a seasoned HR executive with almost thirty years of experience at Indian Oil Corporation (IOC), is slated to become the next Director (Human Resources), as recommended by the Public Enterprises Selection Board (PESB).

The Defence Ministry signed contracts worth 802 crores for military equipment acquisition in New Delhi, including the procurement of 697 Bogie Open Military Wagons (cost: 473 crores) and 56 Mechanical Minefield Marking Equipment (cost: 329 crores). This emphasizes the Buy Indian category, promoting indigenous manufacturing and private sector participation in defence production.

Vice Admiral Dinesh K Tripathi, AVSM, NM, officially took over as the Vice Chief of the Naval Staff on January 4, 2024, succeeding in a distinguished naval career.

Jammu and Kashmir have taken a significant step by becoming the first Union Territory to implement the PM Vishwakarma Yojana, aimed at empowering the vibrant community of artisans and craftspeople, recognizing their crucial role in preserving India's cultural heritage.

The inaugural multi-sports beach games took place in Diu, a Union Territory, featuring over 1,200 players from 20 Indian states and union territories participating in games such as volleyball, beach soccer, and kabaddi.

ISRO successfully tested the 100 W Polymer Electrolyte Membrane Fuel Cell in the PSLV Orbital Experimental Module (POEM) 3, showcasing a significant leap in space power generation using Hydrogen and Oxygen gases.

Lanjia Saura paintings and Dongaria Kondh shawls from Odisha recently received a Geographical Indication (GI) tag, signifying their unique cultural and artistic significance in the state.

Let the price of a saree and a shirt be Rs. x and Rs. y respectively.

Then, 2x + 4y = 1600 .... (i)

    and x + 6y = 1600 .... (ii)

Divide equation (i) by 2, we get the below equation. => x + 2y = 800. --- (iii)

Therefore, y = 200. Now apply value of y in (iii) => x + 2 x 200 = 800 => x + 400 = 800 Therefore x = 400

Solving (i) and (ii) we get x = 400, y = 200.

∴ Cost of 12 shirts = Rs. (12 x 200) = Rs. 2400.

Between 5 and 78:
First number = 6
Last number = 72

Hence, Option D is correct.