Eight cells each having emf 2 V and internal resistance \( r = 0.02 \Omega \) are connected in series with an external resistance 9 \( \Omega \). The current flowing through the external resistance (I) is

Two concentric coils, each of radius \( 2\pi \, \text{cm} \), are placed at right angles to each other. Currents of 3 A and 4 A respectively are flowing through the two coils. The magnetic induction at the center of the coils will be:

A wire of resistance 4 R is bent in the form of a circle. The equivalent resistance between two points diametrically opposite on the circle will be

A current of 10 A is flowing in a wire of length 1.5 m. When placed in a uniform magnetic field of 2 T, it experiences a force 15 N. The angle between the magnetic field and the direction of flow of current is

A steady current flows in a conductor of non-uniform cross-section. The physical quantity which remains constant along the length is :

Consider the following statements:
(A) An emf can be induced by moving a conductor in a magnetic field.
(B) An emf can be induced by changing the magnetic field
(C) An emf can be induced by changing the electric field
(D) An emf can be induced by moving a conductor in an electric field
Choose the correct answer from the options given below:

A concave mirror has radius of curvature 2 m. Light from a distance star is incident on the mirror. The distance of the image of the star from the mirror is :

Read the passage carefully and answer
Carbohydrates are essential for both plants and animals. Some common examples of carbohydrates are glucose, fructose, sucrose, glycogen, cellulose and starch. They form a major portion of our food. Honey has been used for a long time as an instant source of energy in Ayurvedic medicine. Carbohydrates are used as storage molecules in both plants and animals. The cell wall of bacteria and plants is made of cellulose. We use cellulose in the form of wood for making furniture and as cotton fiber for clothing. They also provide raw material for textiles, paper, lacquers, and breweries. Carbohydrates are classified as Monosaccharides, Oligosaccharides and Polysaccharides on the basis of their behavior towards hydrolysis.
Monosaccharides cannot be hydrolyzed further to simpler units whereas oligosaccharides can yield 2-10 units of monosaccharides on hydrolysis. Polysaccharides, which are non-sugars yield a large number of monosaccharide units on hydrolysis.
Answer the following questions about carbohydrates:
Identify a component of starch from among the following.

If A and B are independent events and \(P(A)=\frac{3}{5}, P(B)=\frac{1}{5}\), then \(P(A \cap B)\) is :

Arrange the following carboxylic acids in increasing order of their acid strength.
A. \(CH _3 COOH\)
B. \(CH _3 CH _2 COOH\)
C. \(C _6 H _5 CH _2 COOH\)
D. \(C _6 H _5 COOH\)
Choose the correct answer from the options given below:

Mammals are able to survive in Antarctica or in the Sahara desert as they are

If area of the triangle with vertices \(A(2, k), B(1,1), C(10,8)\) is \(\frac{47}{2}\) sq. units, then one of the values of \(k\) is:

Identify the statement which do not hold true for Deoxyribose Nucleic Acid.
A. Only purine bases are present in DNA.
B. Deoxyribose sugar is present
C. A nitrogenous base is linked to the \(1^{\prime} C\) pentose sugar through N- glycosidic linkage.
D. Phosphate group is linked to OH of \(4 ^{\prime} C\) of a nucleotide.
Choose the correct answer from the options given below: