CHEMISTRY 

1. The ion of an element has 3 positive charge, 27 mass number and 14 neutrons. Find the number of electrons in this ion.

2. The isoelectronic species are

1. Na+

2. Al³+

3. Mg²+

4. Ca²+

3. Which one of the following is the correct electronic configuration of sodium?

4. Electron was discovered by

5. Which of the following elements does not form isotopes?

6. Deuterium and tritium are the isotopes of

7. In Rutherford's experiment, which of the following established the nuclear model of the atom?

8. If there are 12 neutrons in an atom and its atomic number is 11, then how many electrons are present in it?

9. Number of which among the following is same in Al+³ and F¯?

10. Which of the following statements are correct about α (alpha) particle scattering experiment?

(i) Most of the fast moving α-particles passed straight through gold foil.

(ii) Some of α-particles were deflected by the foil by small angles.

(iii) Surprisingly one out of every 10 particles appeared to rebound.

11. Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion :Atomic mass of aluminium is 27.

Reason : An atom of aluminium is 27 times heavier than 1/12th of the mass of carbon-12 atom.

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

12. Assertion : 1 amu equals to 1.66 × 10^-24 g.

Reason : 1.66 × 10^-24 g equal to 1/12 the mass of a 12^C atom.

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

13. Assertion : Atoms can neither be created nor destroyed.

Reason : Atoms of the same element always have the same atomic masses.

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

14. Assertion : Isobars are identical in chemical properties.

Reason : Isobars have different mass number.

15. The valency of an element with atomic number 15 is____________.

16. The total number of electrons present in the M-shell of sulphur is_________.

Rutherford, in 1911, performed an experiment in which he bombarded a thin foil of a heavy metal like gold with a beam of fast moving alpha (α)-particles which are doubly charged helium ions (He²+) having 2 units of positive charge and 4 units of mass (4u). These were obtained from radium placed in the cavity of a block of lead and made into a fine beam with a slit.

17. Rutherford's α-particle scattering experiment showed that

(i) electrons have negative charge.

(ii) the mass and positive charge of the atom is concentrated in the nucleus.

(iii) neutrons exists in the nucleus.

(iv) most of the space in an atom is empty.

Which of the above statements are correct?

Rutherford, in 1911, performed an experiment in which he bombarded a thin foil of a heavy metal like gold with a beam of fast moving alpha (α)-particles which are doubly charged helium ions (He²+) having 2 units of positive charge and 4 units of mass (4u). These were obtained from radium placed in the cavity of a block of lead and made into a fine beam with a slit.

18. Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order :

(i) Rutherford's atomic model

(ii) Thomson's atomic model

(iii) Bohr's atomic model

Rutherford, in 1911, performed an experiment in which he bombarded a thin foil of a heavy metal like gold with a beam of fast moving alpha (α)-particles which are doubly charged helium ions (He²+) having 2 units of positive charge and 4 units of mass (4u). These were obtained from radium placed in the cavity of a block of lead and made into a fine beam with a slit.

19. In Rutherford's experiment, most of the α-particles were observed to

Rutherford, in 1911, performed an experiment in which he bombarded a thin foil of a heavy metal like gold with a beam of fast moving alpha (α)-particles which are doubly charged helium ions (He²+) having 2 units of positive charge and 4 units of mass (4u). These were obtained from radium placed in the cavity of a block of lead and made into a fine beam with a slit.

20. One of the drawbacks of Rutherford's atomic model is,

21. How many moles are present in 11.5 g of sodium?

22. Common hydrogen is also called

23. Adding an alpha particle to the nucleus of sodium atom produces which new element?

24. The atomic number of an element X is 19. The number of electrons in its ion X^+ will be

25. An ion having a mass number 52 has 3 units of positive charge. The number of neutrons in the ion exceeds the number of electrons in it by 7. The atomic number of the element is

PHYSICS: 

1. A cell is used to :

2. In metals, current flows due to the movement of:

3. If n electrons pass through the cross-section of a conductor in time t, the current in conductor I =

4. The S.I. unit of current is :

5. Rheostat is used in a circuit to provide :

6. An instrument used to measure the magnitude of current flowing in a circuit is :

7. The unit of potential difference is :

8. A larger wire offers _____ resistance than a shorter wire.

9. Upon increasing the temperature, the resistance of a wire:

10. The force of attraction between two masses each of 1 kg kept at a separation of 1 m is :

11. The S.I. unit of g is :

12. The relationship between g and G is:

13. A body of mass 25 kg is taken from the earth to the moon. If the value of g on moon is 1.6 ms-², then the weight of the body on moon is :

14. To every action there is always :

15. A footballer hits a football with a force of 10 N. What force does the footballer experience ?

16. Newton's third law :

17. Newton's first law of motion defines force :

18. The S.I. unit of force is :

19. Force is a _______ quantity.

20. A force is needed to :

21. Which of the following is a contact force ?

22. The non-contact force is :

23. A vector quantity possesses :

24. A vector quantity is :

25. The motion of a train on a straight track is an example of _____ motion :

MATHS 

1. If 18 - 3p = 6p + 9, then p =

2. The value of x, if 13x + 7 = - 9 - 3x is

3. Given that 5m - 6 = 3 + 2m, the value of m =

4. If p is added to -5, then the result is 7. The value of 3p is

5. Twenty years ago, Tina's age was one-third of what it is now. Tina's present age is

6. The number which should be added to twice the rational number -7/3 to get 3/7 is

7. Madhulika thought of a number, doubled it and added 20 to it. On dividing the resulting number by 25, she gets 4. What is the number?

8. What is the least number which should be subtracted from 326 to make it a perfect square?

9. Which of the following numbers is not perfect square?

10. The square of 33 is

11. Which of the following numbers is a perfect cube?

12. Possible unit digit of cube root of a number ending with 5 is

13. The surface area of a cube is 216 cm². What is its volume?

14. A number exceeds 20% of itself by 40. The number is

15. 12.5 % of 192 = 50% of x, then x =

16. One-third of 1206 is what percent of 134?

17. 8/40 is equivalent to

18. A man sold a radio for Rs. 1980 and gained 10 % . The radio was bought for

19. If 70 % of the students in a school are boys and the number of girls be 504, then number of boys is

20. If 5 men take an hour to dig a ditch, how long should it take 12 men to dig a ditch of the same type?

21. If 100 students take 20 days to complete the project, then how much time will be taken by 125 students?

22. If 200 students take 40 days to complete the project, how much time will be taken by 250 students?

23. Raju types 270 words in 15 minutes. The number of words he will type in 3 minutes is

24. 0.6 of a number equals 0.09 of another number. The ratio of the numbers, is

25. A car travels 432 km on litres of petrol. How far would it travel on 20 litres of petrol?

BIOLOGY

1. Which of the following diseases is non-infectious?

2. The main cause of malaria is:

3. The causative organism of tuberculosis is:
   

4. Which of these diseases is prevented by vaccination?

5. The Pulse Polio Programme was launched to:

6. Infectious diseases spread through:

7. The pathogen of chickenpox is a:

8. Antibiotics are effective only against:

9. The principle of vaccination is based on:

10. Malaria prevention can best be achieved by:

11. The basic structural and functional unit of life is:

12. A prokaryotic cell lacks:

13. Mitochondria are known as:

14. Which organelle is responsible for photosynthesis?

15. Plant cells, unlike animal cells, have:

16. The chromosomes are located in:

17. The Golgi apparatus functions mainly in:

18. The cell membrane is:

19. The cell wall in plant cells is made of:

20. Vacuoles in plant cells are larger because they:

21. Tissue is a group of cells that:

22. Xylem helps in the transport of:

23. Phloem is responsible for transporting:

24. Which of the following is a connective tissue?

25. Cardiac muscles are: