Punjab Police Constable Mock Test - 2 Free Online Test 2026

The SI unit of pressure is the Pascal (Pa). It is named after the French mathematician and physicist Blaise Pascal.

Static electricity refers to the imbalance of electric charges on an object, typically resulting from the transfer of electrons. It is called "static" because the charges remain stationary rather than flowing as an electric current.

Lightning is a natural phenomenon that involves the discharge of static electricity in the atmosphere. It occurs when there is a buildup of electrical charges in the clouds and the ground, leading to a rapid release of energy in the form of a lightning bolt.

Thomson conducted a series of experiments in which he used a cathode ray tube to study 'cathode rays'. He discovered that these rays were composed of negatively charged particles, which were later named electrons. His work marked the discovery of the first subatomic particle, revolutionizing the study of atomic structure.

Bohr’s model describes that there is no change in the energy of electrons as long as they keep revolving in the same energy level and atoms remain stable. This model was proposed by Niels Bohr in 1913. According to his model, electrons revolve in certain stable orbits around the nucleus without the emission of radiant energy. These orbits or shells are associated with definite energies and are also called energy levels. Hence, as long as an electron remains in the same energy level, its energy remains constant and the atom remains stable.

Calcium hydroxide, commonly known as slaked lime or hydrated lime, is a chemical compound with the chemical formula Ca(OH)₂. In this formula, "Ca" represents the symbol for calcium. Therefore, calcium (Ca) is the metal present in calcium hydroxide.

Copper sulfate is an inorganic compound that consists of copper (Cu) ions bonded to sulfate (SO₄) ions. The chemical formula CuSO₄ represents this compound.

In copper sulfate, the copper ion (Cu²⁺) has a positive charge of 2, while the sulfate ion (SO4^2-) has a negative charge of 2. To balance the charges, one copper ion combines with one sulfate ion, resulting in the formula CuSO₄.

It's worth noting that copper sulfate exists in various forms, including anhydrous copper sulfate (CuSO₄), which is a white powder, and hydrated copper sulfate, which contains water molecules in its crystal structure. The most common form is pentahydrate copper sulfate (CuSO₄·5H₂O), which appears as blue crystals.

Copper sulfate is widely used in various applications, such as agriculture, electroplating, fungicides, and as a laboratory reagent.

Ethylene is the plant hormone responsible for the ripening of fruits. It is a gaseous hormone that is naturally produced by plants during various stages of their development, including fruit ripening. Ethylene acts as a signal to initiate and accelerate the ripening process in fruits by triggering changes in color, texture, aroma, and taste.

During fruit ripening, ethylene promotes the breakdown of chlorophyll, which leads to changes in pigmentation. It also stimulates the production of enzymes that break down complex carbohydrates into simpler sugars, resulting in the sweetening of fruits. Additionally, ethylene affects the softening of fruit tissues by breaking down cell walls and pectins, leading to a softer and juicier texture.

While auxin, cytokinins, and other plant hormones have important roles in various aspects of plant growth and development, ethylene is specifically associated with fruit ripening.

Auxin is a plant hormone that plays a crucial role in various aspects of plant growth and development, including preventing the abscission or shedding of leaves, flowers, and fruits. It helps in maintaining the attachment of these structures to the plant, thereby saving the crops from falling off prematurely.

While the other hormones mentioned in the options also have important roles in plant physiology, auxin specifically helps in preventing the loss of crops by promoting cell elongation, which aids in keeping the plant parts firmly attached.

The chief architect of Ayodhya Ram temple is Chandrakant Sompura. Chandrakant comes from a family which has already been engaged in temple construction work for years. Notable temples designed by him include Somnath Temple in Gujarat, Swaminarayan Temple in Mumbai, Akshardham Temple Complex in Gujarat and Birla Temple in Kolkata.

Senior Indian Police Service (IPS) officer Daljit Singh Chaudhary has been appointed Director General of Sashastra Seema Bal (SSB). Daljeet Singh is a 1990 batch IPS officer of Uttar Pradesh cadre. The post of SSB Director General was vacant after former chief Rashmi Shukla was appointed DGP of Maharashtra earlier this month. The SSB guards India's borders with Nepal and Bhutan.

India International Science Festival (IISF) 2023 was organized in Haryana from January 17 to 20, 2024. It was concluded in the presence of state Chief Minister Manohar Lal Khattar. On the occasion, the Chief Minister also announced the state government's plans to develop a state-of-the-art science city spread over 50 acres in Faridabad. Several MoUs were signed at IISF 2023.

President of the 78th session of the United Nations General Assembly, Dennis Francis, reached New Delhi on a five-day visit to India. The Ministry of External Affairs said, this visit is an opportunity to advance India-United Nations relations and exchange views on India's priorities and global challenges. On the occasion of Republic Day on January 26, Francis will participate in Maharashtra's Republic Day Parade as the state guest.

Kuchipudi dancer Pendyala Lakshmi Priya was honored with the Pradhan Mantri Rashtriya Bal Puraskar 2024 by President Draupadi Murmu. Priya, a 15-year-old class 10 student from Kazipet, Telangana, was honored for her excellence in the field of art and culture. He is one of the 19 children who were honored in various categories this year.

A record drought hitting the Amazon rainforest has revealed petroglyphs carved by humans up to 2,000 years ago that are now partly submerged in one of the largest rivers in the region. The pre-Columbian engravings were found at a point in the Brazilian city of Manaus, where the Negro River’s dark waters meet the Amazon River. The images carved into the rocks depict humans, animals and geometric shapes, such as squares and circles.

A vision document aimed at making India a developed country is in its final stages and a draft is expected to be ready by December, as per NITI Aayog CEO BVR Subrahmanyam.
NITI Aayog was tasked with the consolidation of the ten sectoral thematic visions in July this year including infrastructure, welfare, commerce and industry, technology, and governance. NITI Aayog has also forecasted that India’s economy will be worth $30 trillion in 2047, with a per capita GDP of $17,590.

India is on track to operationally deploy its own long-range air defense system by 2028-29. This indigenous system is designed to detect and destroy a wide array of threats, including stealth fighters, aircraft, drones, cruise missiles, and precision-guided munitions at ranges of up to 350 km.
The ambitious project, known as Project Kusha, is under the purview of the Defense Research and Development Organization (DRDO). The Long-Range Surface-to-Air Missile (LR-SAM) is being developed to provide interception capabilities similar to the Russian S-400 Triumf air defense system recently inducted by the Indian Air Force (IAF).

Let:
Number of students in Room A = x
Number of students in Room B = y

Condition 1:
If 10 students are sent from A to B, then both rooms have the same number:

x − 10 = y + 10

x − y = 20   (Equation 1)

Condition 2:
If 20 students are sent from B to A, then A has double the students of B:

x + 20 = 2(y − 20)

x + 20 = 2y − 40

x − 2y = −60   (Equation 2)

Solving the equations:
From Equation (1):
x = y + 20

Substitute into Equation (2):
(y + 20) − 2y = −60
−y + 20 = −60
−y = −80
y = 80

Now find x:
x = y + 20 = 80 + 20 = 100

Final Answer:
The number of students in Room A is 100.

Correct option: c

Total income of the year = 5 × 21,000 + 4 × 24,000 + 3 × 12,000 + 1,80,000 = 4,17,000

Hence, Option B is correct.

Let the number be x, 3x, 4x and 7x. Then, x + 3x + 4x + 7x = 75
⇒ 15x = 75 , x = 5
Required value = 7 * 5 = 35