KARTET 2022

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below:

The force on the wire due to the magnet is directed

The frequency of electricity produced by DC generator is equal to

An electric motor is a device which transforms

The shape of the magnetic field lines produced by a current carrying conductor are

A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:

A: Held stationary

B: Moved away along its axis

C: Moved towards along its axis

There will be a induced current in

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is

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

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be north to south.

Choose the incorrect statement.

In the arrangement shown in figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Commercial electric motors do not use

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in figure. In the field an electron and a proton move as shown. The electron and the proton experience.

For a current in a long straight solenoid N and S-poles are created at the two ends. Among the following statements, the incorrect statement is

A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to

If the key in the arrangement as shown below is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are

Choose the incorrect statement from the following regarding magnetic lines of field

In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called

Direction of rotation of a coil in electric motor is determined by

When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is

The factors on which one magnetic field strength produced by current carrying solenoids depends are

The nature of magnetic field line passing through the centre of current carrying circular loop is

The pattern of the magnetic field produced by the straight current carrying conducting wire is

Which of the following statement is not correct about the magnetic field?

Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the

Magnetic effect of current was discovered by

The most important safety method used for protecting home appliances from short circuiting or overloading is

To convert an AC generator into DC generator

The strength of magnetic field inside a long current carrying straight solenoid is

The movement of a plant part in response to the force of attraction exerted by the earth is called

Electrical impulse travels in a neuron from

The dramatic changes in body features associated with puberty are mainly because of the secretions of

A doctor advised a person to take injection of insulin because his

Which of the following control and regulate the life process?

Which of the following controls the involuntary actions in the body?

Iodine is necessary for the synthesis of which of the following hormone?

The number of pairs of nerves which arises from the spinal cord are

Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called

A growing seedling is kept in a dark room. A burning lamp is placed near to it for a few days. The top part of seedling bends towards the burning candle. This is an example of

The stimulus in the process of thigmotropism is

The growth of tendrils in pea plants is due to the

The main function of abscisic acid in plants is to

The movement of shoot towards light is

Spinal cord originates from

Posture and balance of the body is controlled by

Which of the following statements are true about the brain?

(i) The main thinking part of brain is hind brain.

(ii) Centres of hearing, smell, memory, sight, etc., are located in fore brain.

(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain.

(iv) Cerebellum does not control posture and balance of the body.

Which of the following statements are true?

(i) Sudden action in response to something in the environment is caller reflex action

(ii) Sensory neurons carry signals from spinal cord to muscles.

(iii) Motor neurons carry signals from receptors to spinal cord.

(iv) The path through which signals are transmitted from a receptor to muscle or a gland is called reflex arc.

Which is the correct sequence of the components of a reflex arc?

In a neuron, conversion of electrical signal to a chemical signal occurs at/in

In a synapse, chemical signal is transmitted from

Which of the following statements is correct about receptors?

In humans, the life processes are controlled and regulated by

Junction between two neurons is called

Which of the following endocrine glands is unpaired?

The hormone which increase the fertility in males is called

Dramatic changes of body features associated with puberty are mainly because of secretion of

Dwarfism results due to

Which statement is not true about thyroxin?

When a person is suffering from severe cold, he or she cannot

A student traces the path of a ray of light passing through a rectangular slab for three different values of angle of incidence (∠i ) namely 30^o, 45^o and 60^o. He extends the direction of incident ray by a dotted line and measures the perpendicular distance ‘l’ between the extended incident ray and the emergent ray.He will observe that

Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given, The correct way to measure accurate focal length of the mirror is

A student traces the path of a ray of light passing through a rectangular slab, For measuring the angle of incidence, he must position the protractor in the manner shown in the figure

While performing an experiment on determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen as given figure, Which diagram shows the formation of image correctly?

 A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is

 Which of the following can make a parallel beam of light when light from a point source is incident on it?

A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is

A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:

Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?

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

Under which of the following conditions, a concave mirror can form an image larger than the actual object?

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is

An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get

Which of the following mirror is used by a dentist to examine a small cavity?

An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be

In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure?

You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at some angle would bend the most

 The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

 The laws of reflection hold good for

In torches, search lights and headlights of vehicles, the bulb is placed

A full length image of a distant tall building can definitely be seen by using

A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at

You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is

If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be

Which of the following property is generally not shown by metals?

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

Which of the following alloys contains a non-metal as one of its constituents?

Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of

Which of the following pairs of reactants will go undergo a displacement reaction?

Which among the following is the most abundant metal found in the earth’s crust?

Which of the following pairs will give displacement reactions?

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be

Which of the following represent the correct order of decreasing reactivity?

In the given reaction, Al₂O₃ + NaOH   →  ……X……   +  H₂O, What is element X?

In electrolytic refining, the cathode is made up of

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

What happens when calcium is treated with water?

(i)  It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

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

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

The ability of metals to be drawn into thin wire is known as

Electrical wires have a coating of an insulating material. The material, generally used is

Generally non-metals are non-conductors of electricity. Which of the following is a good conductor of electricity?

Although metals form basic oxides, which of the following metals form an amphoteric oxide?

The electronic configurations of three elements X, Y and Z are X — 2, 8: Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

Reaction between X and Y forms compound Z. X loses electron and y gains electron. Which of the following properties is not shown by Z?

Which among the following alloys contain mercury as one of its constituents?

Which among the following statements is incorrect for magnesium metal?

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

 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.

During electrolytic refining of zinc, it gets

An electrolytic cell consists of

(i) Positively charged cathode

(ii) Negatively charged anode

(iii) Positively charged anode

(iv) Negatively charged cathode

2 mL each of conc. HCl, HNO₃, and a mixture of conc. HCl. and conc. HNO₃, in the ratio of 3 : 1 were taken in test tubes labeled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

Which of the following is the molecular formula of cyclobutane?

The property of self-linkage among identical atoms to form long chain compounds is known as

Which of the following compounds of carbon does not consist of ions?

The I.U.P.A.C name of CH₃CH₂CH=CH₂ is?