The hormone secreted by male gonad is:

Which of the following is a correct match?

According to cell theory: 

The driving force of any ecosystem is

Which of the following is a unisexual flower?

Assertion: The flexibility in young plants is due to the presence of a thin epidermal layer.

Reason:  Collenchyma  allows bending of various parts of the plant without breaking.

Ozone forms by the combination of free oxygen atoms and oxygen molecules. How do free oxygen atoms form at higher levels of the atmosphere?

In what ways non- biodegradable substances affect the environment?

Assertion: Lysosomes are often called as ‘Suicidal bags of the cell’.

Reason:  Lysosomes contain hydrolytic enzymes capable of digesting cellular waste.

Which statement shows the interaction of an abiotic component with a biotic component in an ecosystem?

Which of the following is true about abscisic acid?

Assertion: In a food chain, members of next (higher) trophic levels are fewer in numbers

Reason: number of organisms at any trophic level depends upon the availability   of organisms which serve as food at the lower level.

Which of the following statements is true?

Which of the following hormones is responsible for strengthening the uterus wall so as the implantation can be supported?

Choose the correct order of binary fission in Leishmania

The diagram given below represents magnetic field caused by a current-carrying conductor which is:

A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be:

A 100m sprinter increases her speed from rest uniformly at the rate of 1 m/s^-2 up to 40m and covers the remaining distance with a uniform speed. The sprinter covers the first half of the run in t1 and second half in t2  then.

A light ray enters from medium A to medium B as shown in Figure.The refractive index of medium B relative to A will be:

The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be:

Three different circuits (I, II and III) are constructed using identical batteries and resistors of R and 2R ohm. What can be said about the current ‘I’ in arm AB of each circuit.

(I)

(II)

(III)

The gravitational force of attraction between two objects is x. Keeping the masses of the objects unchanged, if the distance between the objects is halved, then the magnitude of gravitational force between them will become:

A current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should passed in the conductor:

A 20kg gun fires a bullet of mass 20g with a city of 400m/ s. The action on the shoulder of the person per second by the gun is:

The north pole of earth's magnet is in the:

The day is longer on the earth by about 4 minutes because:

In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (∠i) and in each case measure the values of the corresponding angle of refraction (∠r) and angle of emergence (∠e). On the basis of your observations your correct conclusion is:

When three identical bulbs of 60 W- 220V rating are connected in series to a 220V supply, the power drawn by them will be.

During a football match the ball shot towards the goal struck the defender's foot at the speed of 10m/s and it bounces back at 20m/s. If the time of impact was 0.2s and mass of the ball is 0.5kg then the average force exerted by the defender on the ball will be.

A convex lens A of focal length 20cm and a concave lens B of focal length 5cm are kept in contact. If a parallel beam of light falling on the combination meets at distance …..in cm

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following

The self linkage property (catenation) is maximum in

A functional group mainly determines the

The combining capacity of an element is called

Which of the following statement is not correct?

Which one of the following metals do not react with cold as well as hot water?

If we keep cold drink bottle in freezer, what will happen?

Calcium phosphate is present in tooth enamel. Its nature is

Curd cannot be stored in

(i) Brass vessel
(ii) Copper vessel
(iii) Steel
(iv) Bronze

Buckminsterfullerene is an allotropic form of

Carbon exists in the atmosphere in the form of

Which of the following statements about graphite and diamond is true?

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

Which of the following is the purest form of carbon?

Ag₂S reacts with H₂SO₄ to form

How many numbers from 11 to 50 are there which are exactly divisible by 7 but not divisible by 3?

If 'blue' is called 'green', 'green' is called 'white', 'white' is called 'red', 'red' is called 'black',

then what is the colour of sky?

Satish remembers that his brother's birthday is after fifteenth but before eighteenth of February whereas his sister Kajal remembers that her brother's birthday is after sixteenth but before nineteenth of February. On which day in February is Satish's brother's birthday?

In a chess tournament each of the seven players will play every other player exactly once. How many matches will be played during the tournament?

If in a certain language mystify is coded as nztujg, how is nemesis coded in that language?

If the day before yesterday was Saturday, what day will fall on the day after tomorrow?

 In a cricket season India defeated Australia twice, West Indies defeated India twice, Australia defeated West Indies twice, India defeated New Zealand twice and West Indies defeated New Zealand twice. Which country has lost the most number of times?

In the following question, one number is wrong in the series. Find out the number. 3, 12, 36, 144, 431, 1728, 5184

If Kunal says, "John's mother is the only daughter of my mother." how is Kunal related to John?

In the following question, determine the number that replaces the question mark.

In a certain code language tap is written as szo then in the same code language freeze is written as

If '+' means '-', '÷' means '+', '-' means '×' and '×' means '÷', then which of the following

equation is correct?

Find the day of the week on 26 January, 1950

Pointing to a man a woman said: "his mother is the only daughter of my mother." how is the woman related to the man?

In the following question, one number is wrong in the series. Find out the number. 385, 462, 572, 396, 427, 671, 264