When a projectile moves upward , its vertical component of velocity ?
A. Remains same
B. Decrease
C. increase
D. a and c
EVERYDAY SCIENCE
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Ceramic magnets are _____ ?
A. Conductors
B. Semiconductors
C. Insulators
D. a and b
The reverse of LED is ____ ?
A. Photodiode
B. Capacitor
C. Diode
D. Resistor
The light used in optical fiber transmission is _____ ?
A. Monochromatic
B. Pentachromatic
C. Dichromatic
D. All of these
The back emf of a motor which is just started is ____ ?
A. Optimum
B. Zero
C. Maximum
D. Minimum
If the momentum of an object is increased twice, then what will be the kinetic energy ?
A. Thrice
B. Sixteen times
C. Twice
D. Four times
Mass spectrometer is used to determine Mass number of isotopes and ___________ ?
A. Relative abundance
B. Atomic number
C. Electronic configuration
D. All of these
Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally ________ ?
A. ionic substances
B. covalent network solids
C. molecular solids
D. metallic substances
All of the following substances are crystalline except ________ ?
A. Ice
B. Plastic
C. Sucrose
D. Diamond
Which of the following is a substance ?
A. Graphite
B. Brass
C. Tape water
D. Sand