261.
Var(X) = 4 and Var(Y) =9. If X and Y are independent random variable then Var(2X + Y) is:
A
13
B
17
C
25
D
-1
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Var(X) = 4 and Var(Y) =9. If X and Y are independent random variable then Var(2X + Y) is:
13
17
25
-1
If standard deviation of the values 2, 4, 6, 8 is 2.236, then standard deviation of the values 4, 8,12, 16 is:
4.472
4.236
2.236
An automobile manufacturer obtains data concerning the sales of six of its deals in the last week of 1996. The results indicate the standard deviation of their sales equals 6 autos. If this is so, the variance of their sales equals:
Square root of 6
6
(1/square root of 6)
36
A candle is placed in front of a convex mirror behind principal axis P. The image produced by the mirror is:
Real, inverted and magnified
Real, inverted and demagnified
Virtual, upright and magnified
Virtual, upright and demagnified
A candle is placed in front of a concave mirror between pricipal of axis P and focus F. The image produced by the mirror is:
Real, inverted and magnified
Real, inverted and demagnified
Virtual, upright and magnified
Virtual, upright and demagnified
A candle is placed in front of a concave mirror between focus F and center of curvature C. The image produced by the mirror is:
Real, inverted and magnified
Real, inverted and demagnified
Virtual, upright and magnified
Virtual, upright and demagnified
A candle is placed in front of a concave mirror at a distance freater than center of curvature C. The image produced by the mirror is:
Real, inverted and magnified
Real, inverted and demagnified
Virtual, upright and magnified
Virtual, upright and demagnified
When an object is placed in front of a plane mirror the image is:
Upright, magnified and real
Upright, the same size and virtual
Inverted, demagnified and real
Inverted, magnified and virtual
If an object is located inside the focal length of a diverging lens, then compared to the object, the image will be
smaller
larger
the same size
none of the above
If an object is located between the focal point and a converging lens, the image will be
larger than the object
real
upside down
all of the above
An object is placed in front of a diverging lens at a distance between F and 2F. The image produced by the lens is:
Real, inverted and demagnified
Real, inverted and magnified
Virtual, upright and magnified
Virtual, upright and demagnified
An object is placed in front of a converging lens at a distance less than F. The image produced by the lens is:
Real, inverted and demagnified
Real, inverted and magnified
Virtual, upright and magnified
Virtual, upright and demagnified
An object is placed in front of a converging lens at a distance greater than 2F. The image produced by the lens is:
Real, inverted and demagnified
Real, inverted and magnified
Virtual, upright and magnified
Virtual, upright and demagnified
An object is placed in front of a converging lens at a distance between F and 2F. The image produced by the lens is:
Real, inverted and demagnified
Real, inverted and magnified
Virtual, upright and magnified
Virtual, upright and demagnified
An object is placed at the focal point in front of a concave mirror. The image is located:
The distance d>R
The distance d
The distance F
No image is formed
An object is placed at the center of the curvature in front of a concave mirror. The image is located:
The distance d=R
The distance d
The distance F
The focal point
An object is located far away from a concave mirror. The image is located at:
The distance d>R
The distance d
The distance F
The focal point
An image formed by a single diverging lens
is upside down
can be projected on a wall
is virtual
is larger than the object
A converging lens
converges parallel rays of light
refracts parallel rays of light
is thicker in the center than at the edges
all of the above
As wavelength gets longer, the laser light can be focused to
Larger spot sizes
Smaller spot sizes
None of the above