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671. The practice of transplantation is used in cultivation of which of the following crops ? 1. Jowar 2. Rice 3. Tomatoes 4. Chillies
A. 1 and 2
B. 2 and 3
C. 1, 2 and 3
D. 2, 3 and 4
Explanation:
672. Long distance photography is facilitated by
A. Visible light
B. X-rays
C. Infrared rays
D. Ultraviolet rays
Explanation:
673. Which of the following diseases is not caused by bacteria ?
A. Leprosy
B. Typhoid
C. Tuberculosis
D. Measles
Explanation:
674. The picture tube of a black and white T.V. set has only one electron gun that produces the picture on its screen. The number of electron guns, a colour picture tube has, is
A. five
B. three
C. four
D. six
Explanation:
675. The device that separates light into its component wave lenghts is
A. Photometer
B. Interferometer
C. Spectrometer
D. Polarimeter
Explanation:
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