If there were a reduction in gravitational effect, which of the following forces do you think would change in some respect?

1.  Magnetic force
2.  Electrostatic force
3.  Viscous force
4.  Archimedes's uplift

Subtopic: Newton's Law of Gravitation |

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Q8:

Two batteries of emf 4 v and 8 V with internal resistance 1Ω and 2Ω respectively are connected to an external resistance R = 9Ω as shown in figure. The current in circuit and the potential difference between P and Q respectively will be

1.

2.

3.

4.

Subtopic: EMF & Terminal Voltage |

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Q10:

A body at a temperature of 728 ° C and has surface area 5 cm², radiates 300 J of energy each minute. The emissivity is
(given Boltzmann constant

)

1.  e = 0.18
2.  e = 0.02
3.  e = 0.2
4.  e = 0.15

Subtopic: Stefan-Boltzmann Law |

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Q11:

Considering normal incidence of ray, the equivalent refractive index of combination of two slabs shown in figure is

1.  1.8
2.  1.43
3.  2
4.  None of the above

Subtopic: Refraction at Plane Surface |

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Q12:

Three particles having charges in the ratio of 2 : 3 : 5 produce the same point on the photographic film in Thomson experiment. Their masses are in the ratio of

1.  2 : 3 : 5
2.  5 : 3 : 2
3.  15 : 10 : 6
4.  3 : 5 : 2

Subtopic: Various Atomic Models |

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Q14:

A black body emits heat at the rate of 20 W. When its temperature is 727 ° C. Another black body emits heat at the rate of 15W, when its temperature is 227 º C. Compare the area of the surface of the two bodies, if the surrounding is at NTP.

1.  16 : 1
2.  1 : 4
3.  12 : 1
4.  1 : 12

Subtopic: Conduction |

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Q15:

The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate by using the formula $P = \frac{F}{l^{2}}$ . If the maximum errors in the measurement of force and length are 4% and 2% respectively, then the maximum error in the measurement of pressure is

1.  1%
2.  2%
3.  8%
4.  10%

Subtopic: Errors |

88%

From NCERT

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Q16:

The transfer ratio β of a transistor is 50. The input resistance of the transistor, when used in the common emitter mode is 1kΩ. The peak value of the collector alternating current for an input peak voltage of 0.01 V is

1.