KSEEB - 10 SCIENCE - MODEL QUESTION PAPER - 1 - KEY ANSWER

      KSEEB - 10 SCIENCE     

    MODEL QUESTION PAPER - 1  25-26   

     KEY ANSWER   

I. Four alternatives are given for each of the following questions / incomplete statements. Choose the correct alternative and write the complete answer along with its letter of alphabet.              2 × 1 = 2 

1. The S I unit of potential difference is 

(A) volt (V) 

(B) ampere (A) 

(C) coulomb (C) 

(D) ohm meter (Ωm) 

Ans: (A) volt (V)

2. The reciprocal of focal length of lens is 

(A) the power of lens 

(B)  the radius of curvature of lens 

(C) equal to the sum of object distance and image distance 

(D) equal to the difference between the object distance and image distance 

Ans: (A) the power of lens 

II. Answer the following questions :  2 x 1 = 2 

3. Write the symbols of the following components used in the electric circuit. (i) Dry cell (ii)  Rheostat 

Ans: 

4. Observe the below figure. When switch is closed, does the B end of the solenoid attract the N end of the bar magnet? Clarify the answer. 

Ans: 

★ Attraction occurs only if end B becomes South pole.

★ So,  B acts as South pole, then it attracts the N end of the magnet.

III. Answer the following questions : 3 x 2 = 6 

5. What precautionary measures have to be taken to avoid overload in domestic circuit? 

Ans: 

★ Live and neutral wires should not come into direct contact.

★ Too many appliances should not be connected to a single socket.

★ Should always use quality wires and good quality electrical appliances.       (Any two) 

6. Mention the factors on which resistance of a conductor depend. 

Ans:

★ Length of a conductor

★ Area of cross-section of a conductor

★ Nature of the material 

★ Temperature.   (Any two)

7. Observe the figure given below. Name the angle of deviation and identify its value. 

Ans:

★ the angle of deviation is angle G  

★ its value is 38^o