POLYCET (2022) - 7
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మీకు ఏవైనా కీ లోపాలు దొరికితే లోపాలు మాకు తెలియజేయడానికి వెనుకాడవద్దు.
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The number of terms needed to get Sn = 0 in the A.P, 18, 16, 14 …
The ratio of the sums of first m and n terms of an A.P, is m2 : n2. Then the ratio of the mth term and nth term is
a. (m-1) : (m+1)
b. (m-1) : (n-1)
c. (2m-1) : (2n-1)
d. (m+1) : (n+1)
In an A.P, d = 7 and a22 = 149. Then sum of first 22 terms of that A.P, is
Which term of the A.P, 3, 8, 13, 18 … is 78 ?
In an A.P, the first term is 12, 7th term is 24 less than the 11th term. Then the 20th term of that A.P, is
If the sum of three consecutive terms of an A.P, is 45, the middle term of three terms is
The 7th term of an A.P, is 40. Then the sum of its first 13 terms is
In an A.P, a8 = -23 and a12 = -39 then that A.P, is
a. 5, -1, -3, 7 …
b. 5, 1, -3, -7 …
c. -5, -1, -3, -7 …
The sum of first 20 terms of the A.P, 1, 4, 7, 10 … is
If a, 7, b, 23, c are in A.P, then a + b + c =
What is the name given to line joining focal point, pole and centre of curvature ?
a. Focal length
b. Focal lens
c. Principal axis
d. Focal point
A real and inverted image of the same size is formed by a convex lens , when the object is placed
a. Between F and C
b. At C
c. At F
d. Between F and Optical centre
Which of the following lens act as converging lens
a. Biconvex lens
c. Convex concave
d. Plano convex lens
When a refracted ray is distracted from its original path this displacement is called
b. Lateral displacement
The virtual image formed with a convex lens when the object is placed
a. At C
b. Beyond C
c. At F
d. Between P and F
An object is placed at a distance of 10 cm from a convex lens of focal length 10 cm. The image is formed at
a. 20 cm
b. 10 cm
d. 100 cm
The parallel rays to principal axis after refraction convergent at
b. Beyond C
d. Centre of curvature
If focal length (f) is 20 cm and object distance (u) is 30 cm is placed on the principal axis of convex lens then , What is the value of image distance (v) ?
a. 60 cm
b. 20 cm
c. 40 cm
d. 80 cm
The ratio of speed of light in air to speed of light in any medium is called
a. Radius of curvature
b. Absolute refractive index
d. Refractive index
Refractive indices of water , sulphuric acid , glass and carbon disulphide are 1.33 , 1.43 , 1.53 , 1.63.The light travels slowest in
a. Sulphuric acid
c. Carbon disulphide
Brain is present in bony box called
The energy used for whole body by the brain is
Plants with weak stems like in cucumber and bittergourd show………
Name the gland which is close to trachea
Pad like swellings near the leaf base of mimosa pudica,which are sensitive to touch are called
a. Cells of malvini
c. Pulvini cells
Afferent nerves are also known as
a. Sensory nerves
b. Motor nerves
c. Mixed nerves
Root initiation is proposed by
d. Abscisic acid
The largest region of brain
c. Medulla oblongata
Roots of plants growing towards water in the soil is called
Name the hormone which control the menstrual cycle in females