State the number of triangles included in the figure:
To determine the number of triangles in the given diagram, we need to identify all distinct triangles formed by the intersecting lines.
Counting all these, we find a total of 7 triangles.
Correct Option: C) 7
Which of the following is not true about acids?
Conduct electricity in aqueous medium/liquid state
Forms H+ in aqueous medium/liquid state
React with metals to produce carbon dioxide gas
Sour in taste
The question asks to identify the statement that is NOT true about acids. We need to evaluate each option based on the known chemical and physical properties of acids.
Correct Option: C) React with metals to produce carbon dioxide gas
This statement is incorrect because acids react with most active metals to produce hydrogen gas, not carbon dioxide gas. Carbon dioxide gas is produced when acids react with carbonates or bicarbonates.
This problem involves understanding directions and rotations. We need to determine Sandhya's final direction after two rotations and then figure out what rotation Ramani needs to make to face that same direction.
D) 90° anti-clockwise
As calculated, Sandhya ends up facing North. Ramani starts facing East, and a 90° anti-clockwise rotation from East leads to North.
The question asks to identify the plant tissue characterized by living cells that are long and irregularly thickened at the ends. We need to recall the characteristics of different simple permanent plant tissues.
C) Collenchyma — Collenchyma cells are indeed living, often elongated, and are characterized by unevenly thickened cell walls, particularly at the corners or ends, which provides flexible mechanical support to growing parts of the plant.
To find the average marks of the whole class, we need to calculate the total marks obtained by all students and divide it by the total number of students. Since the number of boys and girls is given as a ratio, we can assume a convenient number of students or use variables to represent them. The average marks for each group (boys and girls) are provided.
A) 67.1 is the correct average marks for the whole class, calculated by taking the weighted average of the marks of boys and girls based on their respective numbers.
How many atoms are present in a molecule of Ca(OH)2?
To determine the total number of atoms in a molecule of Ca(OH)\(_2\), we need to identify each element present and count the number of atoms for each element, then sum them up.
Thus, there are 5 atoms in one molecule of Ca(OH)\(_2\).
C) 5 is the correct answer because there is 1 Calcium atom, 2 Oxygen atoms, and 2 Hydrogen atoms, totaling 5 atoms.
The question asks to identify the word that is different from the rest, implying that three words share a common characteristic while one does not. We need to analyze the properties or origins of each material listed in the options.
Correct Option: A) Plastic
Plastic is a synthetic material, typically derived from petroleum, and is generally non-biodegradable or takes an extremely long time to decompose. The other options (Wood, Paper, Wool) are all natural materials and are biodegradable.
The question asks to identify the political party led by Pu Zoramthanga. This requires knowledge of prominent political figures and their affiliations, particularly in the context of Indian states.
Correct Option: D) Pu Zoramthanga is a veteran politician from Mizoram and has served as the Chief Minister of the state. He is the leader of the Mizo National Front (MNF), a regional political party in Mizoram.
This is an analogy question where we need to find the relationship between the first pair of words and apply the same relationship to the third word to find the fourth word.
Correct Option: A) Old
The question asks about the nature of the speed of a boy sitting on a swing. We need to analyze the motion of a swing to determine how its speed changes over time.
D) Oscillatory – The speed of a boy on a swing is not constant; it continuously changes throughout the swing's motion, being maximum at the bottom and zero at the extreme ends. This varying speed is a defining characteristic of oscillatory motion.