Explanation Benzene is more volatile because it has a low boiling point and evaporates quickly at room temperature. Volatility refers to a liquid's tendency to vaporize — benzene does so more readily than the others listed.

Explanation Methanol (CH₃OH) is polar due to the presence of the highly electronegative –OH group and its bent geometry. Other molecules like CO₂ and CCl₄ are non-polar because of their symmetrical shape, despite having polar bonds.

Explanation Isotopes are atoms with different atomic masses that have the same atomic number. The atoms of different isotopes are atoms of the same chemical element ; they differ in the number of neutrons in the nucleus. Isotopes: The isotopes are a group of atoms that have the same atomic numbers but different mass numbers. That means all isotopes of an element have the same number of protons in their atomic nuclei and the same number of electrons in the electron cloud surrounding the nucleus. Difference between isotopes Isotopes differ in the total number of neutrons present in their respective atomic nuclei. Thus they have different mass numbers. Different isotopes of the same element are having different masses. Protium (1 proton,1 electron, and no neutrons), Deuterium (1 proton, 1 electron, and 1 neutron), and Tritium (1 proton, 1 electron, and 2 neutrons) are examples of isotopes of Hydrogen.

Explanation 1 radian ≈ 57.3 degrees , based on the formula:  1 radian = 180/𝜋 degrees . It is a standard angular measurement in mathematics and physics .

Explanation Gold has the symbol Au . It has the atomic number 79. This making it one of the higher atomic number elements found in nature.

Explanation Step 1: Let's denote the two numbers as x and y. We have two equations: 1. x + y = 28 2. x - y = 4 Step 2: Solve the system of equations. Adding the two equations eliminates y: (x + y) + (x - y) = 28 + 4 2x = 32 Step 3: Solve for x. x = 32 / 2 x = 16 Step 4: Solve for y. Substitute x into one of the original equations: 16 + y = 28 y = 28 - 16 y = 12 Step 5: Identify the correct pair of numbers. The numbers are 16 and 12.

Explanation Total parts = 6 + 4 = 10; each part = 1300 ÷ 10 = Rs. 130 Smallest part = 4 × 130 = Rs. 520

Explanation Chromosomes are thread-like structures made of DNA and proteins , found in the nucleus of eukaryotic cells. They carry genetic information and ensure its accurate distribution during cell division .

Explanation Reproduction ensures the continuation of a species by passing genetic material to offspring. It maintains biodiversity and helps species adapt to environmental changes.

Explanation The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells. Explanation vacuum Tubes were replaced by Transistors. Second-generation computers emerged with the development of Transistors. The transistor was invented in 1947 b y three scientists  J. Bardeen, W.H Brattain and W. Shockley. ND16-3-2023 ND5-07-2023 Explanation Dawn was founded by  Quaid-e-Azam. Dawn is the largest and oldest English-language newspaper in Pakistan and the country's newspaper of record.  Dawn headquarters : Karachi  Explanation Abid Ali as Dilawar has performed in one of the lead roles of Waris Directed by: Nusrat Thakur; Ghazanfer Ali Written by: Amjad Islam Amjad No. of episodes 13 Distributor PTV language : Urdu country of origin : Pakistan The first episode was aired from PTV-Lahore on Saturday 29 December 1979 and the last on 22 March 1980  ND17-1-2023 Explanation There have been only 6 nationwide censuses. First Census was held in Pakistan in 1951. The second Census was held in Pakistan in 1961. The third Census was held in Pakistan in 1972. The fourth Census was held in Pakistan i n 1981. The fifth Census was held in Pakistan in 1998. The Sixth Census was held in Pakistan in 2017. The seventh census was held in Pakistan in 2023 Additional Information: Census has been undertaken every 10 years it was beginning in 1872 under British viceroy Lord Mayo agm.5.3.23na19112023 Explanation According to the Pakistani government, on 3 March 2016, Jadhav was arrested inside Balochistan in Mashkel near the border region of Chaman Jadhav was arrested on the charges of terrorism and spying for India's intelligence agency , the Research and Analysis Wing. Jadhav was born to a Marathi family in Sangli, Maharashtra, on 16 April 1970 to  On 10 April 2017 , Jadhav was sentenced to death by a Field General Court Martial in Pakistan. Years active 2003–2016 ND20-6-2023 Explanation The "Day of Deliverance"     led by Muslim League President Muhammad Ali Jinnah On 2 December 1939 , Jinnah put out an appeal , calling for Indian Muslims to celebrate 22 December 1939 as a "Day of Deliverance" from Congress  during the Indian independence movement. ND15_7_2023 Explanation The blue colour of the sky is due to the scattering of light by the atmospheric particles. Light of shorter wavelengths scatters more than the light of longer wavelengths and the violet colour has a shorter wavelength , but our eyes are more sensitive to blue light. Hence, the colour of a clear sky is blue. Explanation List of Microsoft Excel filename extensions Sr# Format Extension 1 Excel Workbook (2007 to 2019) .xlsx 2 Excel Macro-Enabled Workbook (code) .xlsm 3 Excel Binary Workbook .xlsb 4 Template .xltx 5 Template (code) .xltm 6 Excel 97- Excel 2003 Workbook .xls 7 Excel 97- Excel 2003 Template .xlt 8 Microsoft Excel 5.0/95 Workbook .xls 9 XML Spreadsheet 2003 .xml 10 XML Data .xml 11 Excel Add-In .xlam 12 Excel 97-2003 Add-In .xla 13 Excel 4.0 Workbook .xlw 14 Works 6.0-9.0 spreadsheet .xlr Explanation Thomas Edison  was an American inventor.  “ In 1879 , he made an incandescent bulb that burned long enough to be practical, long enough to light a home for many hours