Entrance questions and solution for Class XI Science

                        OBJECTIVE QUESTIONS
                               FOR BIOLOGY

1. Sympathetic nervous system is also called as:

    a) Central nervous system

    b) Peripheral nervous system

    c) Autonomous nervous system

    d) None

     Ans. 3

2. Which one of the following diseases results from endocrine disorder?

    a) Pneumonia      b) Goitre       c) Typhoid      d) Jaundice

     Ans. 2

3. Liver secretes:

     a) No enzymes       b) Digestive enzymes     c) Hormones      d) Succus entericus

     Ans. 1

4. Urea is transported by:

     a) Plasma      b) Blood      c) RBC      d) WBC

     Ans. 1

5. Maximum absorption of water in mammals is in:

     a) Lungs      b) Skin      c) Kidney      d) Spleen

     Ans. 3

6. Which one of the followings, is not the excretory organ:

    a) Kidney     b) Liver      c) Lung      d) Spleen

    Ans. 4

7. Plants are similar to animals because:

   a) They respire during night

   b) They respire during the day and night

   c) They respire when it is required

   d) They respire during the day only

   Ans. 2

8. Which one of the following acts both as endocrine and exocrine gland?

    a) Adrenal     b) Pancreas      c) Kidney     d) Liver

    Ans. 2

9.  Fat soluble vitamins are:

    a) A, D, & E

    b) B, C, and D

    c) B and C

    d) A, B and C

    Ans. 1

10. Which one of the following diseases results from endocrine disorder?

    a) Pneumonia      b) Goitre       c) Typhoid      d) Jaundice

     Ans:2

                                             FOR PHYSICS

1. Total internal reflection can occur when lights passes from:

(a) a denser to rarer medium  

(b) a rarer to denser medium  

(c) one medium to another of equal refractive index 

(d) medium to another of equal absorption coefficient
 Ans: a

2. Sound energy is converted into electrical energy in a:      

(a) loud speaker           (b) microphone            (c) sonometer      (d) earphone           

 Ans: b

3. The numerical value of average velocity to average speed is:       

(a) always less than one    (b) always greater than one    (c) always equal to one     (d) equal or less than one

 Ans: b

           

4. Newton’s first law of motion gives the concept of:          

(a) energy            (b) work         (c) inertia         (d) momentum

 Ans: c

           

5. The mass of a particle at the centre of the earth is:

(a) zero            (b) slightly more than at the poles         (c) infinite        (d) same as at the poles       

 Ans: a

6. The rear view mirror in a car is:      

(a) plane mirror            (b) concave mirror         (c) convex mirror         (d) None    

 Ans:   c

7. A convex mirror gives an image which is: 

(a) real and inverted       (b) virtual and inverted          (c) virtual and erected      d) virtual and magnified

 Ans: c

8. A boat full of scrap iron is floating on water in a lake. If all the iron is dropped into water the water level will:

(a) go up            (b) remain the same      (c) rise very high        (d) fall down

 Ans:  d

9. The velocity of electromagnetic wave is:   

(a) 2 ×108m/s   (b) 3 ×1011cm/s           (c) 332m/s        (d) 3 ×108m/s

 Ans: d

           

10. An object is projected upwards with a velocity of 100 m/s. It will strike the ground in about:

(a) 5s         (b) 10s         (c) 20s           (d) 15s

 Ans: c

                           FOR CHEMISTRY

1. Which of the following oxide imparts the green colour in the glass?        

(a) PbO            (b) Cr2O3         (c) Fe2O3         (d) ZnO

 Ans: b

           

2. Froth floatation is the process of concentration of which of the ores?     

(a) Oxide         (b) Sulphide   (c) Carbonate   (d) Sulphate

 Ans: b

3. Which of the following is known as philosophers wool?  

(a) ZnSO4.7H2O          (b) ZnO           (c) FeSO4.7H2O      (d) FeO

 Ans: b

         

4. The rxn NH$4 CNO NH$2 – CO – NH$2 is of the type:

(a) Oxidation –reduction        (b) Isomerization         (c) Neutralization        (d) Analysis

 Ans: 

           

5. Who is the father of chemistry?     

(a) Dalton                (b) Berzellius          (c) Lavosier  (d) None

 Ans: c

           

6. Formalin is used as:

(a) Disinfectant reagent          (b) Preservation of biological specimens         (c) Both a and b          (d) None

 Ans: b

           

7. Monomer of Bakelite plastic is:     

(a) phenol + formaldehyde     (b) carbolic acid + Acetaldehyde        (c) phenol + ethyl alcohol           (d) None

Ans: a

           

8. Who has discovered molecule term?         

(a) Dalton        (b) Avogadro     (c) Rutherford          (d) None

Ans: d

         

9. Who has discovered nucleus of the atom?

(a)Avogadro    (b) Rutherford            (c) Neil Bohr   (d) None

 Ans: b

           

10. Galena is the ore of:         

(a) Silver          (b) Magnesium            (c) Lead           (d) copper

 Ans:  c

                          FOR MATHS

(1) Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is

(a) 5/9
(b) 1/9
(c) 8/9
(d) 4/9
Answer (b) 1/9

(2) A lizard, at an initial distance of 21 cm behind an insect, moves from rest with an acceleration of 2 cm/s2 and pursues the insect which is crawling uniformly along a straight line at a speed of 20 cm/s. Then the lizard will catch the insect after
(a) 19 s
(b) 1 s
(c) 21 s
(d) 25 s
Answer (c) 21 s

(3) If both the roots of the quadratic equation x2 – 2kx + k2 + k – 5 = 0 are less than 5, then k lies in the interval
Here 2 read as Square
(a) (5, 6]
(b) (6, ∞)
(c) (-∞, 4)
(d) [4, 5]
Answer (c) (-∞, 4)

(4) A plane passes through (1, − 2, 1) and is perpendicular to two planes 2x − 2y + z = 0 and x − y + 2z = 4. The distance of the plane from the point (1, 2, 2) is
(a) 0
(b) 2
(c) Square Root of 3
(d) 2 Square Root of 2
Answer (d) 2 Square Root of 2
(5) A tangent drawn to the curve y = f(x) at P(x, y) cuts the x-axis and y-axis at A and B respectively such that BP : AP = 3 : 1, given that f(1) = 1, then
(a) equation of curve is x dy/dx - 3y = 0
(b) normal at (1, 1) is x + 3y = 4
(c) curve passes through (2, 1/8)
(d) equation of curve is x dy/dx + 3y = 0
Answer (c) curve passes through (2, 1/8)

(6) Suppose a population A has 100 observations 101, 102, … , 200, and another population B has 100 observations 151, 152, … , 250. If VA and VB represent the variances of the two populations, respectively, then VA/VB is
(a) 1
(b) 9/4
(c) 4/9
(d) 2/3
Answer (a) 1
(7) The number of values of x in the interval [0, 3π] satisfying the equation 2sin2x + 5sinx − 3 = 0 is
(a) 4
(b) 6
(c) 1
(d) 2
Answer (a) 4
(8) Let W denote the words in the English dictionary. Define the relation R by : R = {(x, y) ∈ W × W | the words x and y have at least one letter in common}. Then R is

(a) not reflexive, symmetric and transitive
(b) reflexive, symmetric and not transitive
(c) reflexive, symmetric and transitive
(d) reflexive, not symmetric and transitive
Answer (b) reflexive, symmetric and not transitive

(9) A particle has two velocities of equal magnitude inclined to each other at an angle θ. If one of them is halved, the angle between the other and the original resultant velocity is bisected by the new resultant. Then θ is
(a) 90°
(b) 120°
(c) 45°
(d) 60°
Answer (b) 120°

(10) A body falling from rest under gravity passes a certain point P. It was at a distance of 400 m from P, 4s prior to passing through P. If g = 10 m/s2, then the height above the point P from where the body began to fall is
(a) 720 m
(b) 900 m
(c) 320 m
(d) 680 m
Answer (a) 720 m