10ERPSPC14F

Five identical bulbs rated as 100 W, 250 volts are connected as shown in figure with a battery of emf 260 V and internal resistance 25 Q. Find power loss in the blub A in watts.

• A) 20 Watt

• B) 15 Watt

• C) 25 Watt

• D) 35 Watt

Chungizan, a Class 10 student is doing experiment in the Physics Lab. She connected an ammeter and a voltmeter in series to a battery having emf E. When a certain resistance (equal to

2R) is connected in parallel with thev oltmeter, the readings of the voltmeter decrease 'n ' times, whereas the reading of the ammeter increases the same number of times. Find the

voltmeter readings after the connection of the resistance.

• A

• B

• C

• D

A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth’s magnetic field, the electron beam will be deflected ...

• downwards

• upwards

• away from the proton beam

• towards the proton beam

Choose the correct option.

• A) remain stationary

• B) rotate about the wire

• C) move away from the wire

• D) move towards the wire

A point object O is placed on the principal axis of a convex lens of focal length 𝒇 = 𝟐𝟎 cm at a distance of 40

cm to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm to right of the lens and a distance 𝒉 below the principal axis. The maximum value of 𝒉 to see the image

is ....

• A) 0

• B) 2.5 cm

• C) 5 cm

• D) 10 cm

Consider the situation in figure. The

bottom of the pot is a reflecting plane

mirror, S is a small fish and T is a

human eye. Refractive index of water is 𝝁. At what distance(s) from itself will the fish see the image(s) of the eye ?

• 
• 
• 

A young boy can adjust the power of his eye-lens between 50 D and 60 D. His far point is infinity. What is the distance of his retina from the eye-lens and what is his near point?

• A) 1cm, 5cm

• B) 10cm, 2cm

• C) 2cm, 10cm

• D) 5cm, 1cm

When Copper metal is treated with dil. Nitric acid, the gas evolved is ...

• 
• 
• 
• 

The oxidation state of +1 for phosphorous is found in :

• A) Phosphorous acid

• B) Orthophosphoric acid

• C) Hypophosphorous acid

• D) Hypophosphoric acid

On strong heating MgC12.6H20, the

product obtained is :

• A) MgCl₂

• B) MgO

• C) MgCl₂.2H₂0

• D) MgCl₂.4H₂0