Which of the following is/are empty set? 
A = {x : x2 + x + 1 = 0 and x Î Z}   B = {x : x is a prime number and 19 < x < 23}

The set {x : x⁴ = 1 and x R} is .....X.... set. Here, X refers to

The universal set for the sets   
A = {x : x² – 5x + 6 = 0} and   
B = {x : x² – 3x + 2 = 0} having least number of elements is

If A = {1, 2, 3}, B = {x € R : x2 – 2x + 1 = 0}, 

If A = (–3, 5) and  B = [–7, 9], then

Two finite sets have m and n elements, respectively. The total number of subsets of first set is 56 more than the total number of subsets of the second set. The value of m and n respectively are

Combine terms: 12a + 26b  - 4b – 16a .

The average of first 50 natural numbers is ………… .

60 Times of 8 Equals to

Consider the sets

10^-6 M NaOH is diluted 100 times. The pH of the diluted base is

In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under STP condition. The current to be passed is

The one which decreases with dilution is

Vapour pressure of pure ‘A’ is 70 mm of Hg at 25^oC. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour pressure of the solution is 84 mm of Hg at 25^oC, the vapour pressure of pure ‘B’ at 25^oC is

A 6% solution of urea is isotonic with

In countries nearer to polar region, the roads are sprinkled with CaCl₂. This is

A compound of ‘A’ and ‘B’ crystallises in a cubic lattice in which ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is

In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

The carbon bond length in benzene is

The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is

An organic compound x is oxidised by using acidified K₂Cr₂O₇. The product obtained reacts with phenyl hydrazine but does not answer silver mirror test. The possible structured of X is

Arrange the following in the increasing of their. Basic strengths CH₃NH₂, (CH₃)₂NH, (CH₃)₂N, NH₃

The one which has least iodine value is

A diabetic person carries a packet of glucose with him always, because

There are 20 naturally occurring among acids. The maximum number of tripeptides than can be obtained is

At what temperature ill the RMS velocity of SO₂ be the same as that of O₂ at 303 K ?

Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is

In thermite process the metal used as reducing agent is:

Which of the following compounds on boiling with alkaline KMnO₄ and subsequent acidification will not give benzoic acid?

In ruby laser, the stimulated emission is due to transition from

A direct current I flows along the length of an infinitely long straight thin walled pipe, then the magnetic field is

convex lens made of glass has focal length 0.15m in air. If the refractive index of glass is 3/2, and that of water is 4/3 the focal length of lens when immersed in water is

Two sources are said to be coherent if they produce waves

Three resistors 1 Ω, 2 Ω, 3Ω resistor a 3 V battery is connected. The current through 3 Ω resistor is -

In a common emitter amplifier the input signal is applied across

Adding detergents to water helps in removing dirty greasy stains. This is because
1. It increases greasy stains. This is because
2. It decreases the oil-water surface tension
3. It increases the viscosity of the solution
4. Dirt is held suspended surrounded by detergent molecules

Choose the correct statement (a) for a cricket ball that is spinning clockwise through air
S1 : Statemlines of air are symmetric around the ball.
S2 : The velocity of air above the ball relative to it is larger than that below the ball.
S3 : The velocity of air above the ball relative to it is smaller than that below the ball.
S4 : There is a net upward force on the ball.

Ferromagnetic materials used in a transformer must have

According to Newton’s corpuscular theory, the speed of light is

For the constructive interference the path difference between the two interfering waves must be equal to

The accurate measurement of emf can be obtained using

A person, with outstretched arms, is spinning on a rotating stool. He suddenly brings his arms down to his sides. Which the following is true about his kinetic energy K and angular momentum L?

Which of the following is not a thermodynamic coordinate?

An antenna uses electromagnetic waves of frequency 5 MHz . For proper working, the size of the antenna should be

The amount of energy released when one microgram of matter is annihilated is

The number of significant figures in the numbers 4.8000 x 10⁴ 48000.50 are respectively

β-decay means emission of electron from

An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is

A string is wound round the rim of a mounted flywheel of mass 20 kg and radius 20 cm. A steady pull of 25 N is applied on the cord. Neglecting friction and mass of the string, the angular acceleration of the wheel is

What is meant by development in child psychology?

Development refers to changes that are?

Which principle states that development follows a definite order?

Which principle states that development proceeds from head to toe?

Development from center to periphery follows which principle?

Which principle states that development is a continuous process?

Development proceeds from?

Which principle says all children do not develop at the same rate?

Development is influenced by?

Which aspect of development deals with emotions and feelings?

Growth mainly refers to?

Growth can be measured in terms of?

Development includes growth plus?

Which one is uantitative in nature?

Which one is ualitative in nature?

Growth usually stops after?

Development continues throughout?

Growth is mainly related to?

Development is more related to?

Which statement is correct?

Which factor is most important for physical growth?

Malnutrition mainly affects which development?

Balanced diet is essential for?

Lack of proper nutrition in early childhood leads to?

Nutrition affects which area most directly?

Intelligence mainly affects which development?

Intelligence is best described as?

Higher intelligence helps in better?

Intelligence influences which development most?

Intelligence is affected by?

Psychosocial development mainly includes?

Healthy social interaction helps in?

Which factor affects emotional development most?

Love and affection mainly influence which development?

Lack of social interaction leads to?

Heredity refers to traits inherited from?

Which factor provides the basic potential for development?

Environment refers to?

Which one shapes inherited potential?

Development is the result of interaction between?

Chronic illness mainly affects which development?

Freuent illness in childhood may lead to?

Injury to the brain affects which development most?

Proper medical care helps in?

Diseases during early childhood affect?

Siblings mainly influence which development?

Peer group plays a major role during?

Interaction with peers helps in developing?

Only child may lack which skill?

Healthy peer relations promote?