Punjab Police Constable Mock Test - 4 - Punjab Police Constable MCQ

The correct answer is B: President appoints the prime minister. President cannot appoint any leader as Prime Minister, but only the leader of the majority party.

- The President's role is to appoint the Prime Minister, who is typically the leader of the majority party in the parliament.
- This process ensures that the Prime Minister has the support of the majority of elected representatives.
- The President does not have the authority to personally select any individual as Prime Minister but must appoint the leader of the party that holds the majority in the legislature.

Surface tension is caused by cohesive forces between the molecules of a liquid, which attract each other and create a tension at the surface.

Neutrons are found in the nucleus of an atom. Electrons are found in the electron cloud surrounding the nucleus.

The atomic number of an element is determined by the number of protons in its nucleus. Electrons and neutrons do not determine the atomic number.

CO₂ is a non-polar molecule primarily because the dipole moment is zero.
In a molecule, a dipole moment is formed when there is a difference in electronegativity between the atoms. This causes a charge imbalance and creates a dipole (two poles, one positive and one negative). In CO₂, the molecule is linear with the oxygen atoms on either side of the carbon atom. While oxygen is more electronegative than carbon, causing each C-O bond to be polar, the linear shape of the molecule ensures that the individual bond dipoles cancel each other out.
Because the molecule is symmetrical, the dipoles on either side of the carbon atom are equal in magnitude but opposite in direction. As a result, the net dipole moment of the entire molecule is zero, making it non-polar.
So, while the linear geometry (option A) and Sp hybridization (option C) contribute to the overall characteristics of CO₂, the best explanation for its non-polarity is the zero dipole moment (option B).

Electronegativity is not an absolute term of the element because it does not refer to a single, independent property of an atom itself, but rather a comparative measure of how strongly an atom in a molecule attracts shared electrons towards itself. It is a relative value, often measured on the Pauling scale, and varies depending on the environment the atom is in and the other atoms it is interacting with. Thus, it is not an inherent, absolute property of the atom in the same way that ionization energy, electron affinity, or atomic size are.

Sunlight is the primary source of energy for most ecosystems. Sunlight provides the energy needed for photosynthesis in plants, which forms the basis of the food chain or food web. Producers, such as plants and algae, convert sunlight into chemical energy, and this energy is then transferred to consumers through their consumption of plants or other animals.

Beaver is an example of a keystone species. Keystone species are those that have a disproportionately large impact on their ecosystem relative to their abundance. Their presence or absence can significantly affect the structure and functioning of the ecosystem. In the case of beavers, their dam-building activities create wetland habitats that benefit a wide range of other species and can even alter the flow of rivers.

Amazon India's last-mile delivery program is called 'I Have Space.'

National Mountain Climbing Day commemorates the remarkable achievement of Bobby Matthews and Josh Madigan, who climbed all 46 peaks of the Adirondack Mountains in New York.

Iga Swiatek secured her first WTA title in her home country, dominating Laura Siegemund with a commanding 6-0, 6-1 triumph in Warsaw, Poland.

Amazon India has inaugurated its first-ever floating store on Dal Lake in Srinagar, Kashmir.

The 'CM Command Centre' is a technological initiative launched in Uttar Pradesh for evaluating governance and ensuring the accessibility of government schemes and services.

The Indian women's hockey team won the Torneo del Centenario 2023 title by defeating hosts Spain 3-0 in Terrassa, Barcelona.

World Ranger Day is observed on July 31st. The theme of World Ranger Day 2023 is "30 by 30," highlighting the goal of conserving at least 30 per cent of the planet's areas by 2030. The tragic loss of eight rangers on duty in Virunga National Park, Democratic Republic of Congo, led to the establishment of World Ranger Day.

The 2023 World Aquatics Championships took place in Fukuoka, Japan from July 14 to July 30.

Prime numbers between 1 and 30 →13, 17, 19, 23 and 29 (5)
Rest are prime numbers.
Total numbers 12 to 29 = 18
Total composite numbers = 13

Hence, Option A is correct.

Using BODMAS, we get 2.79 after simplifying