AIIMS Physics: Questions 147 - 149 of 500

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Question number: 147

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

The vector P=ai^+aj^+3k^ and Q=ai^2j^k^ are perpendicular to each other. The positive value of a is:

Choices

Choice (4) Response
a.

zero

b.

2

c.

1

d.

3

Question number: 148

» Magnetic Effects of Current and Magnetism » Electromagnets and Permanent Magnets

Appeared in Year: 1999

MCQ▾

Question

When a magnetic substance is heated, then it – [AIIMS]

Choices

Choice (4) Response
a.

Becomes a strong magnet

b.

Does not affect the magnetism

c.

Losses its magnetism

d. None of the above

Question number: 149

» Current Electricity » Electric Current

Appeared in Year: 2004

MCQ▾

Question

Eels are able to generate current with biological cells called electro plaques. The electro plaques in an Eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electro plaques. The arrangement is suggestively shown below. Each electro plaques have an emf of 0.15 V and internal resistance of 0.25 Ω. The water surrounding the Eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of 500 Ω, the current an Eel can produce in water is about: - [AIIMS]

A circuit diagram with biological cell

A Circuit Diagram With Biological Cell

Figure shows a circuit diagram to generate current with biological cells called electro plaques. The electro plaques are arranged in 100 rows, each row stretching horizontally along the body of fish containing 5000 electro plaques.

Choices

Choice (4) Response
a.

15 A

b.

1.5 A

c.

30 A

d.

3.0 A

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