The question asks about the primary function of a rheostat in an electric circuit. A rheostat is a variable resistor, and its main purpose is to adjust the resistance in a circuit. This adjustment then influences other circuit parameters like current and potential difference.
Correct Option: B) A rheostat is designed to vary the resistance in an electric circuit. This is its direct and intended function.
This question tests basic spatial reasoning and understanding of common seating arrangements for board games like chess. In a standard chess game, two players sit opposite each other.
Therefore, Pallavi is facing South.
Correct Option: C) South
The question asks to identify the name of the world's lightest satellite, weighing 64 grams, launched by NASA in June 2017, and developed by students from Chennai. This is a factual recall question related to space technology and current affairs.
A) Kalam SAT — Kalam SAT was indeed the world's lightest satellite, weighing 64 grams, developed by students from Chennai (Space Kidz India), and launched by NASA in June 2017. It was named in honour of former Indian President Dr. A.P.J. Abdul Kalam.
This question tests general knowledge about the currencies of different countries. To answer correctly, one needs to know the official currency used in Brazil.
The Brazilian Real (plural Reais) is the official currency of Brazil. It is represented by the symbol R$ and the ISO 4217 code BRL.
Correct Option: B) Brazil
The question asks to identify the allotrope of carbon that has a geodesic globe structure. This requires knowledge of the structures of common carbon allotropes.
A) Fullerene — Fullerenes, especially Buckminsterfullerene (\(C_{60}\)), are known for their spherical, cage-like structure resembling a soccer ball or a geodesic dome. This perfectly matches the description "geodesic globe".
To find the selling price for a 15% gain, we first need to determine the cost price (CP) of the bag. We are given the selling price (SP) and the loss incurred. Using these, we can calculate the CP. Once the CP is known, we can calculate the desired selling price to achieve a 15% profit.
Calculate the Cost Price (CP):
Given that Medha sells her bag for Rs. 300 and loses Rs. 60.
The relationship between Cost Price, Selling Price, and Loss is:
\[ \text{Loss} = \text{CP} - \text{SP} \]We can rearrange this to find the CP:
\[ \text{CP} = \text{SP} + \text{Loss} \]Substitute the given values:
\[ \text{CP} = 300 + 60 = 360 \text{ Rs.} \]So, the cost price of the bag is Rs. 360.
Calculate the Selling Price for a 15% Gain:
To gain 15%, the profit will be 15% of the Cost Price.
The new Selling Price (SP') will be the Cost Price plus the desired Profit:
\[ \text{SP'} = \text{CP} + \text{Profit} \] \[ \text{SP'} = 360 + 54 = 414 \text{ Rs.} \]Alternatively, the selling price for a 15% gain can be calculated directly as:
\[ \text{SP'} = \text{CP} \times \left(1 + \frac{\text{Percentage Gain}}{100}\right) \] \[ \text{SP'} = 360 \times \left(1 + \frac{15}{100}\right) \] \[ \text{SP'} = 360 \times \left(1 + 0.15\right) \] \[ \text{SP'} = 360 \times 1.15 \] \[ \text{SP'} = 414 \text{ Rs.} \]Correct Option: C) Rs 414
This problem involves the concept of work and time, specifically inverse proportionality. If the number of men increases, the time taken to complete the work decreases, and vice versa. We can use the formula \(M_1 D_1 = M_2 D_2\), where \(M\) represents the number of men and \(D\) represents the number of days.
Therefore, 10 more men will be needed.
C) 10 is the correct answer. This is the number of additional men required to complete the work in 4 days.
This question asks for the atomic mass of Calcium. This is a fundamental piece of information in chemistry that needs to be recalled or looked up from the periodic table.
Correct Option: B) 40
The question asks about the location of image formation in hypermetropia. Hypermetropia, also known as farsightedness, is a common vision defect where distant objects are seen clearly, but near objects appear blurred. This defect occurs due to the eye's inability to focus light correctly on the retina.
C) Behind the retina. In hypermetropia, the eye's focusing power is insufficient, causing light rays from near objects to converge at a point behind the retina, leading to blurred vision for close-up tasks.
The following bar graph shows information on the sales of the personal computers by the company “XYZ” for the last 10 years
How many units of personal computers were sold by the company XYZ in 2011?
To determine the number of units sold by company XYZ in 2011, we need to examine the bar graph provided. Each bar represents the sales for a specific year, and the height of the bar corresponds to the number of units sold, measured on the vertical axis in lakhs.
Thus, the number of units sold in 2011 is 50 lakh units.
Correct Option: A) 50