Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several
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(a) Protons and positrons |
(b) a - particles |
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(c) Neutrons |
(d) Protons and a-particles |
(c) Neutrons
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Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A coil of area 
has 500 turns. Magnetic field of 
is perpendicular to the coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is
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(a) 1 V |
(b) 5 V |
(c) 50 V |
(d) Zero |
In a thermocouple, the temperature that does not depend on the temperature of the cold junction is called
|
(a) Neutral temperature |
(b) Temperature of inversion |
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(c) Both the above |
(d) None of the above |
Two positive point charges of 12 μC and 8 μC are 10cm apart. The work done in bringing them 4 cm closer is
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(a) 5.8 J |
(b) 5.8 eV |
(c) 13 J |
(d) 13 eV |
Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is
|
(a) |
(b) |
(c) Zero |
(d) |
In this reaction how many α and β particles are emitted
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(a) 6α,3β |
(b) 3 α, 4β |
(c) 4 α, 3β |
(d) 3α, 6β |
A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is
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(a) 0.2 A |
(b) 0.4 A |
(c) Zero |
(d) 0.1 A |
