Question with Answer TC Railway

1. Which of the following changes to the brightness of the bulbs will occur when the switch  S is closed ?
(a)  X stays same , Y decreases                        
(b) X decreases, Y decreases
(c ) X increases, Y remains the same               
(d) X increases , Y decreases             
Ans (A)
2. Colour of a star is a guide to its temperature which of the following stars would you Expect to be hottest ?
(a) Yellow – white canopies                            
(b) Red Betelgense
(c )  Blue – White Sirius                                    
(d) Yellowish- Alphana Centauri        
Ans (C)
3. Television and computer display picture on
(a) Fluorescent tubes                                        
(b) Discharge tubes
(c) G M tubes                                                   
(d) Cathode ray tubes                        
Ans (D)
4. A concane mirror of focal length ‘f ‘ is immersed in water of refractive index 1.3 . Its Focal length in water will be
(a) equal to f                                                     
(b) f 1.3
(c ) f/ 1.3                                                           
(d)  zero                                              
Ans (C)
5. Two bulbs A and B when connected in parallel across a battery (with no internal resistance ) consume 100 W and 300 W power. Consumption would be
(a) 400 W                                                          
(b) 200 W
(c ) 100 W                                                         
(d) 75 W                                             
Ans  (A)
6. Which part of solar spectrum is primarily absorbed by the ozone layer ?
(a) Infra- red                                                     
(b) Visible
(c ) Ultra- violet                                                
(d) None of these                               
Ans  (C)
7. The  S. I unit of electric current is
(a) volt                                                              
(b) ampere
(c )  coulomb                                                    
(D) ohm                                              
Ans (B)
8.  The S. I unit charge is
(a) ampere                                                      
(b) ohm
(c ) coulomb                                                     
(d) joules                                            
Ans  (C)
9. The S. I unit of potential difference is
(a) volt                                                              
(b) coulomb
(c ) ohm                                                           
(d) ampere                                         
Ans  (A)
10. The electric generator converts
(a) Electric energy into mechanical energy    
(b) Mechanical energy into electrical energy
(c ) Mechanical energy into electrical energy 
(d) None of these                               
Ans (B)
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