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Question

Pulsars are.
I. Source of radio-waves.
II. Rapidly rotating neutron stars with intense magnetic field.
III. So compressed that electrons and protons are forced to combine to form neutrons.
Which combinations is correct?
  1. I and III only
  2. I and II only
  3. I only
  4. I, II and III

A
I and II only
B
I only
C
I, II and III
D
I and III only
Solution
Verified by Toppr

Pulsars are neutron stars that emit radiations including radiowaves.

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Similar Questions
Q1
Pulsars are.
I. Source of radio-waves.
II. Rapidly rotating neutron stars with intense magnetic field.
III. So compressed that electrons and protons are forced to combine to form neutrons.
Which combinations is correct?
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Q2
Assertion :A pulsar is a source of radio waves which change intensity at regular interval of time Reason: A pulsar is a rotating neutron star
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Q3
Question 6
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic number = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
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Q4
Question 6
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic number = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
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Q5

In the product 5mab,

(i) 5 is the numerical coefficient of mab.

(ii) the coefficient of ab is 5m.

(iii) m, a and b are the only factors.


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