Question 51 : Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
1. move towards A
2. move towards B
3. move at right angles to the line joining A and B
4. remain at rest
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Question 52 : Sound waves in air are
1. transverse
2. longitudinal
3. electromagnetic
4. polarised
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Question 53 : In which of the following industries is mica as a raw material?
1. Cement
2. Glass and Pottery
3. Iron and Steel
4. Electrical
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Question 54 : Mach number is used in connection with the speed of
1. sound
2. aircraft
3. spacecraft
4. ships
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Question 55 : Supersonic plane fly with the speed
1. less than the speed of sound
2. of sound
3. greater than the speed of sound
4. of light
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Question 56 : The absorption of ink by blotting paper involves
1. viscosity of ink
2. capillary action phenomenon
3. diffusion of ink through the blotting
4. siphon action
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Question 57 : One should not connect a number of electrical appliances to the same power socket because
1. this can damage the appliances due to overloading
2. this can damage the domestic wiring due to overloading
3. this can damage the electrical meter
4. the appliance will not get full voltage
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Question 58 : Rainbow is due to
1. absorption of sunlight in minute water droplets
2. diffusion of sunlight through water droplets
3. ionisation of water deposits
4. refraction and reflection of sunlight by water droplets
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Question 59 : Light year is a unit of
1. time
2. distance
3. light
4. intensity of light
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Question 60 : Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
1. Pressure and Young's modules
2. Planck's constant and Angular momentum
3. Impulse and moment of force
4. Force and rate of change of linear momentum
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